Pyramid shaped monument with a tall tale attached.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Copenhagen's celebrated theme park and gardens.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A New England curiosity cabinet, one hundred years on.

The designated Jewish quarter in Fez dates back to the 15th century.

This former royal palace with gorgeous gardens became the first museum in Morocco.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

These Honduran caves earned their magical nickname thanks to reflective bone deposits.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This snug medieval lane is one of the narrowest streets in the world.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

An ancient glacial pothole waterfall in the heart of the Green Mountains.