The bridges portrayed on EU currency aren't fictional anymore.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

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

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A preserved college lock-up that recalls a clubhouse approach to discipline.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Crop circles inspired this whimsical garden in Germany.

A German apartment building hosting as many trees as human occupants.

A quiet memorial to those who died saving others in the heart of the City of London.

A meteorite-bounded town in Bavaria.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

Peek through a transparent pyramid and drink in the mountain made of books.

A statue of the second-tallest Dutchman in history.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A hidden subterranean installation offers a view of the sky.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

This historic toy museum brings a little whimsy to a city not usually remembered for such things.

This lurid German fountain plots the sad course of marriage from dating to death.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."