Washington, D.C. was built in the South as a result of a compromise following the American Revolution and the ratification of U.S. Constitution. Alexander Hamilton, the first Secretary of the Treasury, wished to create a National Bank by assuming the debts of the former colonies from the revolution. Because the Southern states had already repaid most of their debt, they were opposed to this plan. In exchange for acceptance, the Founding Fathers offered to locate the national capitol in the South. Out of all the locations in the South, George Washington chose to place it in a new city so that it would not be under the jurisdiction of any existing state.
It was supposed to be on the dividing line between North and South. It was also supposed to be in a "Slave" state (Maryland) to try and keep slavery legal in the USA.
Brasilia, the Capital City of Brazil was purpose built, as Rio de Janeiro was their previous Capital City.
Adelaide, the capital of South Australia, is built on the Torrens River.
The United Nations is not a sovereign state and as such has no capital city. It's headquarters however, are located in New York City.
Washington
Columbia is South Carolina's capital city.
Bangkok, the capital city of Thailand, is south southwest of Vientiane, the capital city of Laos.
it is a stadium in South Africa that was first built for the 1996 African nations cup and was renovated for the 2010 world cup
The capital city of South Australia is Adelaide.
Columbia is the capital city of South Carolina.
Sydney is the capital city of New South Wales.
David built his capital city in Jerusalem.
David built his capital city in Jerusalem.