Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Steadily reminding Czechia of its past.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

Double spiral staircases are not unheard of, but they are very rare.

Apartment complexes built into huge repurposed natural gas tanks.

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

A unique seaside cave where Aleister Crowley faked his own death.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Hundreds of caves filled with thousands of centuries-old statues and murals.

Monks turned this mountain into a temple by digging grottoes, tunnels, and a huge pagoda-like hall.

This doorless 20th-century elevator doesn't stop or slow down.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

It's good luck to be mocked by this monkey.

A preserved college lock-up that recalls a clubhouse approach to discipline.

Elaborate tile work in this railway station tells the story of Portugal.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

Macabre astrological automaton clock dating to the late 1400s.