This elaborate hole in the ground was built as a sacred site for an ancient civilization.

A true Valhalla for cactus and succulent lovers.

A statue of the second-tallest Dutchman in history.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Giant, friendly pelicans in Central London, the most unlikely of places.

One part local history, 99 parts gruesome haunted house.

A hands-off space for graffiti artists to hone and display their skills.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

“And the Lord said unto Johan, build for thee an ark for the end of the world is approaching.”

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

The 20-mile causeway that separates the Netherlands from the sea.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

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

A miniature city, once ruled by the Queen of the Netherlands.

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

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

A grassy pyramid named after a French battle.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

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

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This wrecked airplane has been sitting on a black sand beach since the 1970s.