• Philadelphia
  • Haixi Mongolian and Tibetan Autonomous Prefecture

Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Haixi Mongolian and Tibetan Autonomous Prefecture, Qinghai Autonomous Prefecture, referred to as Haixi Prefecture, is located in the north of the Qinghai-Tibet Plateau and the west of Qinghai Province, with high terrain in the northwest and low in the southeast, which is a typical alpine and dry continental climate zone; the state has a total area of 300700 square kilometers and has jurisdiction over 3 county-level cities, 3 counties and 1 administrative region; in 2017, the resident population is 515200. Haixi Mongolian and Tibetan Autonomous Prefecture is the Qudi of the Qinghai-Tibet Plateau, with Tibet in the south, Gansu in the north and Xinjiang in the west. It is at the center of the confluence of the four provinces and regions of Qinghai, Gansu and New Tibet, and was once the auxiliary road of the ancient "Silk Road" leading to the Western region. Lanxila optical cable, Qingxin optical cable, Qinghai-Tibet 750 kV AC / DC interconnection line run through the whole territory, Golmud-Lhasa product oil pipeline and Xianning-Lanlan gas pipeline are distributed, Qinghai-Tibet railway and national highway.
Travel Sights In Haixi Mongolian and Tibetan Autonomous Prefecture
Travel Notes In Haixi Mongolian and Tibetan Autonomous Prefecture
Looking for the magical and beautiful nature self-driving tour in Qaidam
Qinghai, a place that has a lot of fate with me. This is the third time I have stepped into the beautiful Great Qinghai. I really like places of natur
Explore Haixi under the stars with Starway VX
As early as the early days of human civilization, when the first astronomical records appeared in Mesopotamia, the priests of Babylon discovered the l
What would you like to do in such a Gobi wilderness?
1. Gobi Highway On the northeastern edge of the Qaidam Basin, it borders the Qilian Mountains in the north and the Kunlun Mountains in the south, at a
Another wonder was discovered under the Kunlun Mountains. The desert and the snow-capped grassland have been together for thousands of years
In people's minds, snow-capped mountains must be extremely cold places, especially high-altitude snow-capped mountains and glaciers that do not melt a