Walk through Czech history in Prague's largest graveyard.

This ordinary street was made infamous by a legendary visit from the devil.

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.

This doorless 20th-century elevator doesn't stop or slow down.

A giant interactive periodic table with real samples of the elements.

This artificial cave looks like something out of a fairytale.

A winding, cliffside stretch of road overlooking the Delaware River.

This Central New York ghost town was once a prosperous railroad community.

This intricately spiralling forest was created as a monumental work of art.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

For a buck, students can snag freshly picked apples grown in the university orchards.

The library of every book lover's dreams.