The first American department store, and home to the largest operating musical instrument in the world.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

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

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

The site of the climactic scene from the classic horror film is now a historic landmark.

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

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

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

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Toxic waste disaster that founded the Superfund program.