The most visited, and possibly most controversial, museum in Germany.

What looks like a normal building is really a hollow facade hiding a subway vent.

Museum in a swimming pool where the water still flows.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Paris' linguistic guide to the international language of, yes, love.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

This abandoned Belgian fortress is purposefully being left to nature.

A unique military outpost carved into a rocky outcrop in the English Channel.

A small island that was once a key Axis fortification during World War II.

In France, a medieval-style home pays homage to an intrepid explorer who discovered Québec.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

Folklore and history carved into Brittany's coast.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

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

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

The tallest mountain in mainland Netherlands isn't actually very tall.

A beautiful maze marks where three countries meet.

A distinctive former power plant turned university lecture hall looks like it could make you breakfast.