Whitewashed mosque contains the world's largest carpet.

This bazaar is one of the oldest in the Arabian world.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

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

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

Hear the quietest sound from across the dome.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This famous bridge twisted itself into oblivion, but not for the reason you might think.