Philadelphia

The UNESCO-listed 18th-century Georgia-brick statehouse where the Declaration of Independence and the U.S. Constitution were debated and adopted.

A monumental neoclassical art museum at the end of the Benjamin Franklin Parkway, famous for its galleries and the Rocky Steps.

The oldest continuously inhabited residential street in America, a cobblestoned colonial alley lined with brick rowhouses dating from 1702.

A former 19th-century prison known for its radial cellblock design and notorious inmates, now preserved as an atmospheric historic ruin and museum.

A downtown plaza across from City Hall centered on Robert Indiana's iconic red LOVE sculpture.

The ornate Second Empire city hall topped by a 37-foot statue of William Penn, once the tallest habitable building in the world.