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

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

One street divides a single town that stands in two U.S. states.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

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

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The Atlantis of Cape Cod reemerges during the lowest of tides.

The Cape Cod house that whaling built.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

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

This lesser-visited World Heritage site in Athens boasts an impressive ensemble of medieval gold mosaics.

A solemn reminder of the infamous World War II war crime that massacred almost all the men in a small Greek town.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

The secular incarnation of a religious meditation.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

Where commuters walk through remnants of an ancient Greek necropolis.

A sharp sculpture made of thousands of pieces of jagged glass.

This no man's land slicing through the island is strewn with abandoned relics of another time.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.