For centuries this cliffside aqueduct was believed to be of Roman origin, but it actually dates to the medieval era.

The astonishing collection of an infamous criminologist.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This museum is a portal to 20th-century Denmark.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

Hans Christian Andersen for the postmodern world.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A walkable map of the world, made from soil and stone by one man.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

A museum-like shop that has been producing clogs, brushes, and ropes for nearly 200 years.

This Dutch art piece became a Russian icon.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

Remarkably preserved body discovered in a peat bog.

A bizarre form of natural mummification was discovered in the church of this Frisian village.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

The world's first interactive human body museum also serves as a chair for a giant orange man.