According to folklore, Vermont's slanted windows were installed to keep witches from flying into the house.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

The northernmost international land border crossing in the United States.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

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

The castle still holds traces of the abandoned Roman fort it was built atop.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

The last manually operated turntable ferry in the world.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

One of the most iconic neon ads of former East Germany.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

The romantic botanic tunnel feels like a well-kept secret.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."