One of the indelible moments of the American Revolution took place at this location.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

Enter the cabin of a life-sized Hindenburg replica.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

Tucked away on a hilltop in the backwoods of Mississippi lies the remains of a blues legend.

A curious blend of taxidermy, antique tools, creationism, and a purported antediluvian rock.

Limestone caves with spectacular showcase chambers.

Hundreds of protractors affixed to surfaces all over the city.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

The rusting remains are visible sticking out of the waters of the Delaware Bay.

The Victoria-era quarantine station for Sydney.

Small Island off the coast of Greenland.

Part bookstore, part café, and part forest.

A museum of carnival attractions where you are invited to ride the rides.

Peek through the gates at this oasis from the city, full of Old English charm.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

A preserved 18th century steel factory.

A radio tower with something unusual between its legs.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.