This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

The largest drain hole in the world.

This subterranean spot might be the epitome of Japan's baroque, retro coffee houses.

With over 12,000 different species of plants, this botanical garden is Japan's oldest and most diverse.

The most powerful waterfall in all of Europe.

A striking 12th-century-style castle built on the edge of a cliff.

This pond is so stunning it looks like you've stepped into one of Monet's masterpieces.

A beautifully eclectic mix of architectural styles.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Mai Tais and Navy Grog served up in one of the original tiki bars.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Treehouse motel and treehouse-building school.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Abandoned silver mine strewn with wrecked and twisted structures.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The site of murders and Satanic cult gatherings.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

Colorado's only true geyser is hidden within the San Juan National Forest.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.