The atmospheric road was never meant to be so creepy.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

Northern Ireland's church-turned-skate park.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

An 1814 castle that hosts an exhibit of "explorabilia".

An ancient neolithic tomb that only sees the sun twice a year.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

Obelisks and stone pineapples in the Irish countryside.

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

A village of art and exotic creations.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

Abandoned railway line circling the city of Paris.

An odd museum dedicated to French fakes.

An antique curios dealer and hybrid taxidermist.

A charming flea market shop dedicated to retrofuturistic apparati.

A museum of carnival attractions where you are invited to ride the rides.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.