A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

Caves famous for the dragon-slaying saint who lived there.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A kaleidoscopic warehouse-maze of handmade neon signs.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

Follow the original medieval paths that wind through this intriguing section of the city.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

A winding medieval path was used by mourners to carry their dead to the nearest church.

The undercroft is a spectacular example of medieval Cistercian architecture.

This network of narrow, medieval passages has the most delightful name.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

This 500-year-old Tudor home is a treasure trove of history and mystery.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

The oldest of the three remaining bridges in England with buildings on top of them.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Inspired by a dream, a hermit carved out a home in this sandstone bank to live a life of contemplation and prayer.

What was once England's second-richest abbey is now a haunting ruin.