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

The giant club-wielding wildman stands proud as the symbol of Swedish Lapland.

To find the "unicorns of the deep" you've got to go downstairs.

Dedicated to the first German Chancellor, Otto von Bismarck, this aging edifice is the only one of its kind in the Americas.

This old wooden funicular railway leads to a cemetery in the forest.

The red letters in the literary pavement leading to the library form a mysterious code.

A golden egg-shaped sauna in the Arctic tundra.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

A statue honoring 44 continuous years of greeting passing ships.

The best place in the world to buy tinned fish.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This 11th-century temple gave rise to the word "juggernaut," as well as some mysteries that defy scientific explanation.

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

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

One of the smallest bookstores on the planet.

The final resting place of the controversial chess champion.

A unique museum dedicated to the Gullah-Geechee people, housed within an old oyster cannery.

The quirky collection includes treasures like Elvis' underwear, Bob Barker's toothbrush, and hundreds of sock monkeys.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

The abandoned airport is a strangely intact remnant of Cambodia's brutal Khmer Rouge regime.

A charming Spanish village sits atop this natural limestone overpass.

Because sometimes you need to make a batch of frites even when the stores are all closed.

A 246-foot-high revolving restaurant rises unexpectedly from a forested Finnish hilltop.