Washington, D.C., formally known as the District of Columbia, is the capital of the United States and houses all three branches of the US Federal Government.
Reston, Virginia is an internationally known planned community founded in 1964 and developed by Robert E. Simon.
Columbia, Maryland is a well planned big city and a census-designated place in the United States.
Levittown is a notable example of post-World War II suburban development.
Radburn is a community designed for pedestrian safety, featuring extensive green spaces.
Usonia Historic District is a planned community designed by Frank Lloyd Wright.