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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

Beijing, abbreviated as "Beijing", is the capital of the people's Republic of China and one of the four municipalities directly under the Central Government in China. Beijing is a national central city, a mega city, a national political center, a cultural center, a center for international exchanges, a center for scientific and technological innovation, a world-famous ancient capital and a modern international city. It is also the office location of the Central Committee of Communist Party of China, the Central people's Government of the people's Republic of China and the standing Committee of the National people's Congress. Beijing is located in North China, with longitude 116o 20 'east and latitude 39 °56km north, adjoining Tianjin to the east and Hebei to the east. Beijing has a total area of 16410.54 square kilometers. As of September 2019, Beijing has jurisdiction over 16 municipal districts. The terrain of Beijing is high in the northwest and low in the southeast. Three sides of the west, north and northeast
Airport In Beijing - Beijing Capital International Airport
Beijing Capital International Airport (Beijing Capital International Airport, IATA: PEK, ICAO: ZBAA), located in the northeast suburb of Beijing, China, 25 kilometers southwest of Beijing city center, 67 kilometers south of Beijing Daxing International Airport, is a 4F international airport   , is one of the three major portal complex hubs in China   , members of the international air cargo hub group in the Bohai Rim region   , the world's largest airport   .
Beijing Capital International Airport was built in 1958. On January 1, 1980, supporting projects such as the T1 terminal building, the apron, and the parking lot in front of the building were completed and officially put into use. On November 1, 1999, the T2 terminal was officially put into use, and at the same time, the T1 terminal was closed for renovation. On September 20, 2004, the T1 terminal was put into use again. In the spring of 2008, the airport expansion project (Terminal T3) was completed.  
As of July 2017, Beijing Capital International Airport has three terminal buildings with a total area of ​​1.41 million square meters; there are two 4F runways and one 4E runway   The length and width are 3800×60 meters, 3200×50 meters, 3800 meters×60 meters respectively; there are 314 seats in total; 252 domestic and foreign routes have been opened.    
From 1978 to 2018, the annual passenger throughput of Beijing Capital International Airport increased from 1.03 million to 101 million, ranking first in Asia and second in the world.   In 2019, the passenger throughput of Beijing Capital International Airport was 100.013 million passengers, a year-on-year decrease of 1.0%; the cargo and mail throughput was 1.9553 million tons, a year-on-year decrease of 5.7%; , No. 2, No. 1.  
In 2021, Capital Airport will add three new domestic destinations, namely Huai'an, Tumusuk and Jingzhou   .
Travel Notes In Beijing
Beijing to Datong - Hanging Temple - Taiyuan - Pingyao Ancient City self-driving homework
first day It is best to drive to Datong one day in advance. The journey is about 346.7 kilometers and the time-consuming: 5 hours and 30 minutes. Choo
2021 Beijing Tongzhou Latest May Day 3 Days 2 Nights Parent-child Travel Guide Check-in Panoramic Attractions
In 2021, the much-anticipated Beijing Tongzhou Universal Studios will be completed and is expected to start trial operation in the near future. Tongzh
Seeking marriage must go! The 2020 Beijing Spring Festival Temple Fair Must-Visit Hongluo Temple New Year Prayer Raiders
"There is Putuo in the south, and Hongluo in the north." During the Spring Festival, many people will go to Hongluo Temple to worship the Buddha and p
Tanzhe Temple
Take a break and write down the old travel notes. The following is the Tanzhe Temple visited on New Year’s Day in 2019. Tanzhe Temple is located at th