This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

Dr Barnes' $25 billion private collection of art and arboretum.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

A daily replay of the experiment that proved the rotation of the Earth.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."