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Indianapolis (/ˌɪndiəˈnæpəlɪs/), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Marion County was 977,203 in 2020. The "balance" population, which excludes semi-autonomous municipalities in Marion County, was 887,642. It is the 15th most populous city in the U.S., the third-most populous city in the Midwest, after Chicago and Columbus, Ohio, and the fourth-most populous state capital after Phoenix, Arizona, Austin, Texas, and Columbus. The Indianapolis metropolitan area is the 33rd most populous metropolitan statistical area in the U.S., with 2,111,040 residents. Its combined statistical area ranks 28th, with a population of 2,431,361. Indianapolis covers 368 square miles (950 km2), making it the 18th largest city by land area in the U.S.

Indigenous peoples inhabited the area dating to as early as 10,000 BC. In 1818, the Lenape relinquished their tribal lands in the Treaty of St. Mary's. In 1821, Indianapolis was founded as a planned city for the new seat of Indiana's state government. The city was platted by Alexander Ralston and Elias Pym Fordham on a 1-square-mile (2.6 km2) grid next to the White River. Completion of the National and Michigan roads and arrival of rail later solidified the city's position as a manufacturing and transportation hub. Two of the city's nicknames reflect its historical ties to transportation—the "Crossroads of America" and "Railroad City". Since the 1970 city-county consolidation, known as Unigov, local government administration operates under the direction of an elected 25-member city-county council headed by the mayor.

Indianapolis anchors the 29th largest economic region in the U.S., based primarily on the industries of trade, transportation, and utilities; professional and business services; education and health services; government; leisure and hospitality; and manufacturing. The city has notable niche markets in amateur sports and auto racing. The city is home to three Fortune 500 companies, two major league sports clubs (Colts and Pacers), five university campuses, and several museums, including the world's largest children's museum. However, the city is perhaps best known for annually hosting the world's largest single-day sporting event, the Indianapolis 500. Among the city's historic sites and districts, Indianapolis is home to the largest collection of monuments dedicated to veterans and war casualties in the U.S. outside of Washington, D.C.

Tianjin, referred to as Tianjin, is the provincial administrative region, municipality directly under the Central Government, national central city and mega city of the people's Republic of China, and the economic center of the area around the Bohai Sea as approved by the State Council. By 2018, there were 16 districts under the jurisdiction of the city, with a total area of 11916.85 square kilometers, a built area of 1007.91 square kilometers, a resident population of 15.596 million, an urban population of 12.9681 million, and a urbanization rate of 83.15%. Tianjin is located in North China, the northeast of the North China Plain and the lower reaches of the Haihe River Basin, facing the Bohai Sea to the east. It is the confluence and estuary of the five major tributaries of the Haihe River, namely, the South Canal, the Ziya River, the Daqing River, the Yongding River and the North Canal. Tianjin is the main node of the China-Mongolia-Russia Economic Corridor and the Maritime Silk Road.
Airport In Tianjin - Tianjin Binhai International Airport
Tianjin Binhai International Airport (Tianjin Binhai International Airport, IATA: TSN, ICAO: ZBTJ), located in Dongli District, Tianjin, China, 13 kilometers away from the city center, is a 4E-level civil international airport     , is China International Aviation Logistics Center   , an airport with international scheduled flights, a national first-class air port open to the outside world, and one of China's major air cargo centers.    
Tianjin Binhai International Airport, formerly known as Tianjin Zhangguizhuang Airport, was first built in November 1939; it was officially opened to navigation in 1950; the first phase of the expansion project was completed in 2007; the second phase of the expansion project was completed in August 2014.   
According to the official website of the airport in August 2017, Tianjin Binhai International Airport has two terminal buildings, namely T1 (international and regional) and T2 (domestic), with a total construction area of ​​364,000 square meters and a warehouse area of ​​74,000 square meters; It has 2 runways with lengths of 3600 meters and 3200 meters respectively; 59 seats.   By the end of 2016, the airport had opened 180 air routes and 132 navigable cities.  
In 2019, Tianjin Airport handled 23.813 million passengers, a year-on-year increase of 0.9%; cargo and mail throughput was 226,000 tons, a year-on-year decrease of 12.6%; and transported 167,000 vehicles, a year-on-year decrease of 6.4%.  
In October 2020, it was rated as an advanced group in the national transportation system to fight against the new crown pneumonia epidemic.  
Travel Notes In Tianjin
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Tianjin impression. . . . . . memorable
I have been to all the four major municipalities directly under the central government in China, but only Tianjin has not had a good time. I have been
Extraordinary Gengzi Year Simple Leting Seaside and Lion City Tour
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