The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A former major munitions plant that has been converted into a sprawling art space.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

At 207 feet, one of the world's longest continuous escalators.

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

Home to items never before seen by the public.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.