Hand-crafted tributes to a stray cat named "Room 8" now cover this LA elementary school.

This jagged colossus of a building is mostly held together by an enormous concrete exoskeleton.

Inside this clubhouse is a cinephile's paradise.

Rainbow-hued local gem in Venice.

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

An important landmark in the history of algebraic logic.

A teddy bear sits on a chair watching the sunset from the mountaintop—just as the late Dan Clancy had done since childhood.

The ruins of a medieval monastery named after a type of tree.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

Wander among the abandoned ruins of this once-powerful medieval town.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

A moody and picturesque riverside ruin overgrown with vegetation.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.