This medieval manuscript collection has some of the most obscure and ancient texts in the world.

The ruined abbey includes a rare surviving example of a monastic latrine.

The ruins of a medieval monastery built on a perilous slope.

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

Too much gossip or just missing curfew could land you in here for a couple of days.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

A gorgeous stone viaduct crosses over a bucolic valley.

This tangled English forest looks like something right out of a fairytale.

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

The church is gone, but the graves and legends remain.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The mystery of the Putim Ossuary involves a tricorn hat.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

Enormous sandstone towers loom within a Czech forest.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Bohemian paradise covered in majestic forests.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Europe's largest natural bridge has a 19th century royal chateau built into its side.