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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.

Changdao County is a county under the jurisdiction of Yantai City, Shandong Province, named after Changshan Island. It is the only island county in Shandong Province, located between Jiaodong and Liaodong Peninsula, the intersection of the Yellow Sea and Bohai Sea, and located in the connecting zone of the economic circle around the Bohai Sea. Long Island County consists of 151 islands, including 10 residential islands. The island covers an area of 56.8 square kilometers, a sea area of 3541 square kilometers and a coastline of 187.8 kilometers. The main tourist attractions in long Island County are Jiuzhangya, Banyue Bay National Geopark, Miaodao Ancient Temple Group, Fairview Source Folk Custom Park, Linhai Fengshan National Forest Park, Miaodao Mazu Culture Park, Beizhuang site and so on. In June 2018, the people's Government of Shandong Province formally approved the establishment of the long Island Marine Ecological Civilization Comprehensive Experimental area. In November 2018, long Island County was selected in 2018.
Airport In Changdao County - Yantai Penglai International Airport
Yantai Penglai International Airport (Yantai Penglai International Airport, IATA: YNT, ICAO: ZSYT), located in Chaoshui Town, Penglai District, Yantai City, Shandong Province, China, about 43 kilometers away from the center of Yantai, is a 4E-class civil transport airport and a national first-class aviation port   , Member of East China Airport Group   .
Yantai Penglai International Airport officially started construction on December 26, 2009. Its test flight was successful in November 2014, and it officially opened to traffic on May 28, 2015. According to the official website of the airport in February 2019, the airport has a domestic and international terminal area of ​​90,000 square meters, an apron covering an area of ​​400,000 square meters, a runway of 3,400 meters long, and 39 parking spaces, which can meet the needs of large-scale airports such as Boeing 747. The plane took off and landed safely.  
In 2019, the passenger throughput of Yantai Penglai International Airport exceeded 10 million   , an increase of 26.6% year-on-year; the cargo and mail throughput was 41,100 tons, a year-on-year decrease of 4.4%;  
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