The vast, legendary catacombs hold secrets much stranger than stacked bones.

A garden of flying flowers.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

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

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Hiding the longest subterranean river known in the world.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

A failed attempt to control drifting sands yielded a gnarled sylvan wonderland.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Preserved "bog person" that is over 2,000 years old.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

Nordic giants resurrected from the sea and restored to their former greatness.

A small Denmark town displays a pair of titanic jaw bones as their community symbol.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The world's first interactive human body museum also serves as a chair for a giant orange man.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

When you're a great Russian Tsar, even your vomit gets a statue.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.