This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

Where the sleeping monsters of Scotland's oil industry are left to rust.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This historic electric train has operated with regularity since the early 1900s.

Legendary site where an evil bishop was devoured by rodents.

Tiny castle in the middle of the Rhine made you pay to pass.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

Twisted buildings adorn the banks of the Rhine river.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This "floating railway" is one of the world's oldest monorail systems.

This painted Lego bridge is the product of over a century of locomotive history.

If the tunes of antique organs and musical marionettes don't intoxicate you, the draft beer certainly will.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

An unexpected ghost village lurks on the southeast coast of Tenerife.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A plaque marks the former home of Käthe Paulus, an aerial acrobat who invented the modern folding parachute.

An eerie, derelict amusement park in Berlin.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.