Romans built the world's tallest artificial waterfall in 271 BC.

One man's fulfilled dream of living on an artificial island made of recycled plastic bottles.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

The tiny church offers succor to travelers driving by, but only eight at a time.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

Great Britain's only hat-making museum.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

The sacred shrine of the Yazidis.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

The oddly shaped, steam-spewing building is now an art studio and gallery.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

This charming railway is one of the oldest and steepest funiculars in England.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

Go through the looking glass in Tokyo's Wonderland-themed shop.

Bacteria and algae give the salty water its bubblegum hue.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.