Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

A winding, blood-red tunnel of hardened lava navigable by foot.

The decaying ruins of Wales' first asylum for the mentally ill.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

A pagan tradition of draping trees with rags eerily lives on.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

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

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

Extraordinary sculpture garden created by an eccentric English poet.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Mountain where Jesus was first tempted by the Devil.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

This massive underground salt mine now holds a sci-fi theme park in its depths.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.