"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

One of the world's steepest streets seems to have houses sliding down it.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

This railroad track was so secretive that it was omitted from all maps.

Remains of an abandoned coral city.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A medieval setting reimagined into a unique art alley.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

The easternmost town in Alaska can only be accessed from Canada.

Northern Kentucky’s very own Notre Dame showcases intricate stained glass and the bones of saints.

The ruins of Brisbane’s own Alcatraz now sit in the middle of a national park.

This whimsical stacked cabin looks like something out of a children's book.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

Built in the early 70s, the ruins of dinosaurs are all that remains of a man’s dream to build a free dinosaur themed mini golf course

Built in France in the 1400s, this gothic chapel now resides at Marquette University in Milwaukee, Wisconsin.

Visit a prison tower used during witch tribunals.

A busy island at the center of the world that doesn’t actually exist.

The site of an early Arthurian battle and the dwelling-place of prehistoric people and (possibly) an ancient race of giants.

Structure built from the skulls of vanquished foes.

Grab a latte at the birthplace of modern American skateboarding.