The fifth-longest natural arch in the world, and the longest outside China.

This museum glorifies the humble potato.

A museum dedicated to the history and art of staying clean.

The most loyal of little dogs, or a Victorian era publicity stunt?

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

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

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Come for the speed, leave in love with the desert.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

The red letters in the literary pavement leading to the library form a mysterious code.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

An incredibly well-preserved piece of ninth-century Viking poop.

This network of narrow, medieval passages has the most delightful name.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Follow the original medieval paths that wind through this intriguing section of the city.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Regency-era excess on the English Coast.

A mysterious shape catches the eye in this 16th-century painting.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.