Civil War dumping ground for the bodies of terrorized Union sympathizers.

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

Art deco landmark on the outskirts of Washington, D.C.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A museum dedicated to exhibiting remarkable outsider art.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

One of the only memorials dedicated to journalists who died in combat.

Remnants of a storybook amusement park hidden behind a strip mall.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.