Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

The world's longest known cave system.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The oldest residential street in Europe also features an optical illusion.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

A haunting deserted hotel is a favorite with artists and photographers.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The curiosities and wonders of pharmacy in a delightful historic building.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This massive library holds what was once the largest book collection in the world.

A unrivaled and rather horrifying collection of wax dermatological models.

The oldest stone house in Paris was built by its most famous alchemist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.