A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Go inside to really appreciate this 500-year-old technological masterpiece.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Italian cave with exceptional acoustics and an unsavory history.

A museum marks and documents the site of the Titanic's launch.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

Breathtaking and huge 430 year old maps of Italy.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

360° views of the city plus five floors of optical illusions and hands-on science.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A 300-kilogram egg sculpture that embodied a neighborhood revival.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A black cat protests the City Guild in Riga's Old Town.

3,000 market stands in five former Zeppelin hangars.

Liechtenstein's royal family calls this medieval alpine castle home.

In one of the world's smallest countries, a royal's personal winery is open to the public.

Climb right into the heart of this colorful Iceland volcano.