An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

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.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

The largest flower auction house in the world.

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

A modern reimagining of a medieval city gate.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

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

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

The Netherlands' first car tunnel has an unusually rectangular shape.

This large sand dune in the Netherlands is home to wind-whipped trees with "floating" roots.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

This "floating railway" is one of the world's oldest monorail systems.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Thousands of flowers create enchanting pink tunnels over the city streets.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The world's tallest boat lift stands as a massive piece of industrial tourism.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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