This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

This artificial cave looks like something out of a fairytale.

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

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A crucified and bearded female saint.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

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

Macabre astrological automaton clock dating to the late 1400s.

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

Japan’s oldest clock tower has been called one of the country’s most disappointing attractions.

A 1000-year-old shrine in Kyoto with a poorly planned sacred arch.

Southern Italy's spinning top village.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A kaleidoscopic warehouse-maze of handmade neon signs.

This London plaque marks the spot where David Bowie's famous alien made his debut.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

Eighty million natural history specimens call this gargantuan museum home.

A memorial to those who donated their bodies to science.