Real bones which are said to have belonged to a Polish dragon.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

This small group of sand dunes manages to pack in a strange rainbow of colors.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

The best-preserved Roman small town in North Africa.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

Architectural monsters are devouring this palace's every door and window.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Relive a Polish uprising via an enormous, century-old cyclorama.

The silly symbol for an underground protest group is now scattered around the city.

An underground city of salt.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

A church of bones, decorated with 40,000 human skeletons.

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

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.