This fantastic sculpture of an early model helicopter celebrates the local toy industry.

This subterranean studio is filled with fascinating kinetic art.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

The history and future of cannabis.

The attic of a four-century-old canal house hides a clandestine church.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A curious collection dedicated to human and animal anatomy and pathology.

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

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Folklore and history carved into Brittany's coast.

Abandoned since 1998, this train station has become an oasis for urban explorers.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

A collection of weird and wonderful art fills a former houseplant nursery.

Explore 400,000 years of humans' "battle against darkness" in this offbeat but thorough lamp museum.

Descend into the tunnels to experience the life of a coal miner.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.