The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This former steel and coal plant is now a neon-lit industrial fantasia.

Home to the world's oldest functioning orrery.

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

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

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

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

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

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A beautifully eclectic mix of architectural styles.

A former plague hospital turned medical museum.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Historic medieval fortified city in southwest France.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.