Commonly acknowledged as the only public monument to the Devil himself.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

The highest peak in all of England is plagued by dangerously fickle climate shifts.

Huge standing stones mark a site of megalithic mystery.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

The modern birthplace of Irish freedom.

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

Northern Ireland's Brobdingnagian stepping stones.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The sign at the garden gate reads: "These Plants Can Kill."

A subterranean house of worship carved right out of the bedrock.

An abstract monument to a symphonic composer.

Flamboyant architecture from the turn of 20th century.

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

Largest cave system in Africa.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

A mechanized clock where a man fights off a dragon, crab, and rooster.

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

A magnificent, iconic stone tower in the Scottish Highlands.

A red-brick beacon stands against the tempestuous Atlantic, on the windiest site in the United Kingdom.

This stunning concert hall has become a symbol of Iceland's national recovery.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.