The historic home still shows the scars from a little run-in with the British in 1813.

Designed to commemorate the founding of the first settlement in Delaware.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This print shop boasts one of the largest pinball arcades in San Francisco.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Painstakingly built dioramas sit unnoticed in a Boston office building.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This church is named for one of the most dramatic tales in the early Christian church.

These temples are among the oldest free-standing stone buildings in the world.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

A centuries-old forgotten underworld lies beneath Malta.

This subterranean necropolis holds three floors of antler-dug grave caves.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

A record-breaking pool that uses computers to turn ocean water into cleaner, private swimming water.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

An architectural oddity hides in plain sight on this iconic London bridge.