The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

No need to strap in for a "ride" on this walkable roller coaster.

Super-heavy Nazi architectural experiment.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

The last of Amsterdam's original sea level markers remaining in place.

Unchanged for centuries, this medieval library keeps its books in chains.

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

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

A former plague hospital turned medical museum.

This subterranean studio is filled with fascinating kinetic art.

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

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Denmark's famous pseudo-hill.

In legend, this ancient dolmen was said to have been created when a troll tried to destroy a church.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

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

This sublime architectural marvel is a rare example of an expressionist church.

A man has revenged his true love's betrayal through tears and stone genitalia.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

Digger attempting to hide itself under 300 tons of rubble.

Over 9,000 brains collected between 1945 and 1982 demonstrate the results of untreated mental illness.