A lush green oasis in the middle of Chicago.

This shop for all your super spy needs hides an educational secret.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A symbol for the opposition to nuclear power around the world.

These old World War II fortifications have been transformed into an unusual equine attraction.

A public display of random paleontology.

Remnants of the Nazis' occupation of Denmark linger along the sand.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

The decaying remains of a 1960s mechanical wonderland that never officially closed.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

Iron Age "bog person" preserved for over 2,300 years.

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

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.