This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

The glowing blue Nymphaeum of Emperor Tiberius.

Stalactites and stalagmites in a beautifully lit cave.

Renaissance villa and gardens complete with a tormented colossus.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A 16th-century horror show built in a lovely Italian garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A towering monument to war, located on a beautifully peaceful hill.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

Art and a pun, all in one.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An eerie, derelict amusement park in Berlin.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Visitors can swim with vicious predators in Crocosaurus Cove's plastic daredevil enclosure.

Thousands of lawn gnomes have infested this Australian roundabout.

Rainforest filled with record-holding eucalyptus.

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.