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

This life-size monument honors the legacy of a famous literary feline.

The only natural cave bath in all of Europe.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

A historic house left in "dramatic still life."

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Visit on a Sunday morning to see some killer tricks.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

The world's largest model of our planetary system.

Peek into a cave of giant, glimmering crystals.

The final resting place of this rock icon has become a pilgrimage site for AC/DC fans.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Fantastic stainless steel dragon gates complete with mesh wings.

The second-largest giant sequoia in the world.

Ruins of two abandoned stations destroyed by the power they sought to harness.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

The former home of Norway's greatest romantic composer.