An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A diminutive, thousand-year-old church believed to be the smallest in Ireland.

A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

A statue beloved by—and named by—the local townsfolk it represents.

Commemorating a unique medieval profession: men who collected feces.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

It's good luck to be mocked by this monkey.

This demonic monument commemorates a carving destroyed in World War II.

A Neolithic burial site erected around 3000 BC.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

The secret medieval communication system will whisk your words above the noise of the crowd.

A brutalist gem towering over the heart of Milan.

Balconies that have a most unusual accent.

This garden houses the remains of the ancient Greek port of Marseille.

A ghostly and forgotten art deco bathhouse by the windy shore of Dunkirk, weathered but still standing.

Rediscovered in 1992, this abandoned medieval village once flourished by fishing and piracy.

The last Oostende trawler to fish off Iceland is now a museum.

A piece of the front end of a British cruiser that was used as a block ship in World War I.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.