This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

A beautiful hike through national parks, forests and beaches in Western Australia.

A massive concentration of algae is responsible for this lake's pink hue.

Alien rock formations grown from the sands of an Australian national park.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

The prototype for all Nazi concentration camps.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A church of bones, decorated with 40,000 human skeletons.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

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

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Countless grotesque faces stare out from this eerie Prague art wall.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This automated sculpture of two men peeing will spell out text messages with their micturition.

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

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.

A stately palace has been converted into the world's largest cannabis museum.