A mailbox that saved a nature reserve.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

Eighteenth century house of the mysterious "Father of Raleigh."

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

This micro-nation may be some sort of prank, but its constitution sure seems official.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Relive a Polish uprising via an enormous, century-old cyclorama.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

The silly symbol for an underground protest group is now scattered around the city.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

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

The mystery of the Putim Ossuary involves a tricorn hat.

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

An enormous and lavish Gothic church in Czechia.

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

Macabre astrological automaton clock dating to the late 1400s.

Early habitat dioramas and home of the elusive gaff, the skvader.

It houses the remains of a 17th-century version of the Titanic.

Sweden's oldest animated sign is still lighting up the skyline today.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.