Demand for new construction has contributed to frequent demolition of older buildings, freeing space for modern high-rises. However, many examples of European and Lingnan architecture are still found throughout the territory. Older government buildings are examples of colonial architecture. The 1846 Flagstaff House, the former residence of the commanding British military officer, is the oldest Western-style building in Hong Kong. Some (including the Court of Final Appeal Building and the Hong Kong Observatory) retain their original function, and others have been adapted and reused; the Former Marine Police Headquarters was redeveloped into a commercial and retail complex, and Béthanie (built in 1875 as a sanatorium) houses the Hong Kong Academy for Performing Arts. The Tin Hau Temple, dedicated to the sea goddess Mazu (originally built in 1012 and rebuilt in 1266), is the territory's oldest existing structure. The Ping Shan Heritage Trail has architectural examples of several imperial Chinese dynasties, including the Tsui Sing Lau Pagoda (Hong Kong's only remaining pagoda).
The earliest European visitor was Portuguese explorer Jorge Álvares, who arrived in 1513. Portuguese merchants established a trading post called Tamão in Hong Kong waters, and began regular trade with southern China. Although the traders were expelled after military clashes in the 1520s, Portuguese-Chinese trade relations were re-established by 1549. Portugal acquired a permanent lease for Macau in 1557.
After the Qing conquest, maritime trade was banned under the Haijin policies. The Kangxi Emperor lifted the prohibition, allowing foreigners to enter Chinese ports in 1684. Qing authorities established the Canton System in 1757 to regulate trade more strictly, restricting non-Russian ships to the port of Canton. Although European demand for Chinese commodities like tea, silk, and porcelain was high, Chinese interest in European manufactured goods was insignificant, so that Chinese goods could only be bought with precious metals. To reduce the trade imbalance, the British sold large amounts of Indian opium to China. Faced with a drug crisis, Qing officials pursued ever more aggressive actions to halt the opium trade.
The name of the territory, first romanised as "He-Ong-Kong" in 1780, originally referred to a small inlet located between Aberdeen Island and the southern coast of Hong Kong Island. Aberdeen was an initial point of contact between British sailors and local fishermen. Although the source of the romanised name is unknown, it is generally believed to be an early phonetic rendering of the Cantonese pronunciation hēung góng. The name translates as "fragrant harbour" or "incense harbour". "Fragrant" may refer to the sweet taste of the harbour's freshwater influx from the Pearl River or to the odour from incense factories lining the coast of northern Kowloon. The incense was stored near Aberdeen Harbour for export before Victoria Harbour developed. Sir John Davis (the second colonial governor) offered an alternative origin; Davis said that the name derived from "Hoong-keang" ("red torrent"), reflecting the colour of soil over which a waterfall on the island flowed.
In 1839, the Daoguang Emperor rejected proposals to legalise and tax opium and ordered imperial commissioner Lin Zexu to eradicate the opium trade. The commissioner destroyed opium stockpiles and halted all foreign trade, triggering a British military response and the First Opium War. The Qing surrendered early in the war and ceded Hong Kong Island in the Convention of Chuenpi. However, both countries were dissatisfied and did not ratify the agreement. After more than a year of further hostilities, Hong Kong Island was formally ceded to the United Kingdom in the 1842 Treaty of Nanking.
Hong Kong became a colony of the British Empire after the Qing Empire ceded Hong Kong Island at the end of the First Opium War in 1842. The colony expanded to the Kowloon Peninsula in 1860 after the Second Opium War, and was further extended when Britain obtained a 99-year lease of the New Territories in 1898. The whole territory was returned to China in 1997. As a special administrative region, Hong Kong maintains separate governing and economic systems from that of mainland China under a principle of "one country, two systems".
Hong Kong has a humid subtropical climate (Köppen Cwa), characteristic of southern China. Summer is hot and humid, with occasional showers and thunderstorms and warm air from the southwest. Typhoons occur most often then, sometimes resulting in floods or landslides. Winters are mild and usually sunny at the beginning, becoming cloudy towards February; an occasional cold front brings strong, cooling winds from the north. The most temperate seasons are spring (which can be changeable) and autumn, which is generally sunny and dry. When there is snowfall, which is extremely rare, it is usually at high elevations. Hong Kong averages 1,709 hours of sunshine per year; the highest and lowest recorded temperatures at the Hong Kong Observatory are 36.6 °C (97.9 °F) on 22 August 2017 and 0.0 °C (32.0 °F) on 18 January 1893. The highest and lowest recorded temperatures in all of Hong Kong are 39.0 °C (102 °F) at Wetland Park on 22 August 2017, and −6.0 °C (21.2 °F) at Tai Mo Shan on 24 January 2016.
The colony was further expanded in 1898, when Britain obtained a 99-year lease of the New Territories. The University of Hong Kong was established in 1911 as the territory's first institution of higher education. Kai Tak Airport began operation in 1924, and the colony avoided a prolonged economic downturn after the 1925–26 Canton–Hong Kong strike. At the start of the Second Sino-Japanese War in 1937, Governor Geoffry Northcote declared Hong Kong a neutral zone to safeguard its status as a free port. The colonial government prepared for a possible attack, evacuating all British women and children in 1940. The Imperial Japanese Army attacked Hong Kong on 8 December 1941, the same morning as its attack on Pearl Harbor. Hong Kong was occupied by Japan for almost four years before Britain resumed control on 30 August 1945.
Hong Kong has eleven universities. The University of Hong Kong was founded as the city's first institute of higher education during the early colonial period in 1911. The Chinese University of Hong Kong was established in 1963 to fill the need for a university that taught using Chinese as its primary language of instruction. Along with the Hong Kong University of Science and Technology and City University of Hong Kong, these universities are ranked among the best in Asia. The Hong Kong Polytechnic University, Hong Kong Baptist University, Lingnan University, Education University of Hong Kong, Open University of Hong Kong, , Hong Kong Shue Yan University and The Hang Seng University of Hong Kong were all established in subsequent years.
Its population rebounded quickly after the war, as skilled Chinese migrants fled from the Chinese Civil War, and more refugees crossed the border when the Communist Party took control of mainland China in 1949. Hong Kong became the first of the Four Asian Tiger economies to industrialise during the 1950s. With a rapidly increasing population, the colonial government began reforms to improve infrastructure and public services. The public-housing estate programme, Independent Commission Against Corruption (ICAC), and Mass Transit Railway were all established during the post-war decades to provide safer housing, integrity in the civil service, and more-reliable transportation. Although the territory's competitiveness in manufacturing gradually declined due to rising labour and property costs, it transitioned to a service-based economy. By the early 1990s, Hong Kong had established itself as a global financial centre and shipping hub. The colony faced an uncertain future as the end of the New Territories lease approached, and Governor Murray MacLehose raised the question of Hong Kong's status with Deng Xiaoping in 1979. Diplomatic negotiations with China resulted in the 1984 Sino-British Joint Declaration, in which the United Kingdom agreed to transfer the colony in 1997 and China would guarantee Hong Kong's economic and political systems for 50 years after the transfer. The impending transfer triggered a wave of mass emigration as residents feared an erosion of civil rights, the rule of law, and quality of life. Over half a million people left the territory during the peak migration period, from 1987 to 1996. Hong Kong was transferred to China on 1 July 1997, after 156 years of British rule.
Hong Kong developed into a filmmaking hub during the late 1940s as a wave of Shanghai filmmakers migrated to the territory, and these movie veterans helped rebuild the colony's entertainment industry over the next decade. By the 1960s, the city was well known to overseas audiences through films such as The World of Suzie Wong. When Bruce Lee's Way of the Dragon was released in 1972, local productions became popular outside Hong Kong. During the 1980s, films such as A Better Tomorrow, As Tears Go By, and Zu Warriors from the Magic Mountain expanded global interest beyond martial arts films; locally made gangster films, romantic dramas, and supernatural fantasies became popular. Hong Kong cinema continued to be internationally successful over the following decade with critically acclaimed dramas such as Farewell My Concubine, To Live, and Chungking Express. The city's martial arts film roots are evident in the roles of the most prolific Hong Kong actors. Jackie Chan, Donnie Yen, Jet Li, Chow Yun-fat, and Michelle Yeoh frequently play action-oriented roles in foreign films. At the height of the local movie industry in the early 1990s, over 400 films were produced each year; since then, industry momentum shifted to mainland China. The number of films produced annually has declined to about 60 in 2017.
Dragon boat races originated as a religious ceremony conducted during the annual Tuen Ng Festival. The race was revived as a modern sport as part of the Tourism Board's efforts to promote Hong Kong's image abroad. The first modern competition was organised in 1976, and overseas teams began competing in the first international race in 1993.
Although the territory had one of Asia's largest manufacturing economies during the latter half of the colonial era, Hong Kong's economy is now dominated by the service sector. The sector generates 92.7 per cent of economic output, with the public sector accounting for about 10 per cent. Between 1961 and 1997 Hong Kong's gross domestic product increased by a factor of 180, and per capita GDP increased by a factor of 87. The territory's GDP relative to mainland China's peaked at 27 per cent in 1993; it fell to less than three per cent in 2017, as the mainland developed and liberalised its economy. Economic and infrastructure integration with China has increased significantly since the 1978 start of market liberalisation on the mainland. Since resumption of cross-boundary train service in 1979, many rail and road links have been improved and constructed (facilitating trade between regions). The Closer Partnership Economic Arrangement formalised a policy of free trade between the two areas, with each jurisdiction pledging to remove remaining obstacles to trade and cross-boundary investment. A similar economic partnership with Macau details the liberalisation of trade between the special administrative regions. Chinese companies have expanded their economic presence in the territory since the transfer of sovereignty. Mainland firms represent over half of the Hang Seng Index value, up from five per cent in 1997.
Hong Kong represents itself separately from mainland China, with its own sports teams in international competitions. The territory has participated in almost every Summer Olympics since 1952, and has earned three medals. Lee Lai-shan won the territory's first and only Olympic gold medal at the 1996 Atlanta Olympics. Hong Kong athletes have won 126 medals at the Paralympic Games and 17 at the Commonwealth Games. No longer part of the Commonwealth of Nations, the city's last appearance in the latter was in 1994.
As the mainland liberalised its economy, Hong Kong's shipping industry faced intense competition from other Chinese ports. Fifty per cent of China's trade goods were routed through Hong Kong in 1997, dropping to about 13 per cent by 2015. The territory's minimal taxation, common law system, and civil service attract overseas corporations wishing to establish a presence in Asia. The city has the second-highest number of corporate headquarters in the Asia-Pacific region. Hong Kong is a gateway for foreign direct investment in China, giving investors open access to mainland Chinese markets through direct links with the Shanghai and Shenzhen stock exchanges. The territory was the first market outside mainland China for renminbi-denominated bonds, and is one of the largest hubs for offshore renminbi trading.
Political debates after the transfer of sovereignty have centred around the region's democratic development and the central government's adherence to the "one country, two systems" principle. After reversal of the last colonial era Legislative Council democratic reforms following the handover, the regional government unsuccessfully attempted to enact national security legislation pursuant to Article 23 of the Basic Law. The central government decision to implement nominee pre-screening before allowing Chief Executive elections triggered a series of protests in 2014 which became known as the Umbrella Revolution. Discrepancies in the electoral registry and disqualification of elected legislators after the 2016 Legislative Council elections and enforcement of national law in the West Kowloon high-speed railway station raised further concerns about the region's autonomy. In June 2019, large protests again erupted in response to a proposed extradition amendment bill permitting extradition of fugitives to mainland China. The protests have continued into December, possibly becoming the largest-scale political protest movement in Hong Kong history, with organisers claiming to have attracted more than one million Hong Kong residents.
Tourism is a major part of the economy, accounting for five per cent of GDP. In 2016, 26.6 million visitors contributed HK$258 billion (US$32.9 billion) to the territory, making Hong Kong the 14th most popular destination for international tourists. It is the most popular Chinese city for tourists, receiving over 70 per cent more visitors than its closest competitor (Macau). The city is ranked as one of the most expensive cities for expatriates.
Life expectancy in Hong Kong was 82.2 years for males and 87.6 years for females in 2018, the sixth-highest in the world. Cancer, pneumonia, heart disease, cerebrovascular disease, and accidents are the territory's five leading causes of death. The universal public healthcare system is funded by general-tax revenue, and treatment is highly subsidised; on average, 95 per cent of healthcare costs are covered by the government.