A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

A Jenga-style cylindrical tower of books that appears to go on forever.

The hidden lair of an alchemist rediscovered in a 2002 flood.

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

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

2300-year-old Roman road connecting the empire.

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

An optical Illusion once believed to be an electrical phenomenon.

Five candy-colored villages on the Italian Riviera.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

An intricate and amazing house built by architect Karl Junker.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.