A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

An underground city of salt.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

An early 20th-century bullring converted into a modern shopping center.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Dramatic river bend surrounds a natural red-rocked pedestal.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Most-visited and most-photographed slot canyon in the American Southwest.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

The rusted creatures wait to be discovered in Prague's botanical garden.

This spooky statue sits outside a famous Prague theater.

A series of playful yellow penguins share a serious message about the environment.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.