European castle ruins in an American state park are actually the product of death and grief.

London's smallest police station is barely the size of a phone booth.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

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

The first declared National Monument in the United States.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Legends surround this jagged rock formation in the New Mexico desert.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A building so large that it has its own weather.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The final resting place of soldiers' loyal canine companions.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A six-ton wedding present for the King of the Scots.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.