Rare collection of medieval books under lock and key.

These unique stepping stones hug a river's edge to take hikers on a journey through a limestone gorge.

The only medieval bridge in Britain with its defensive tower still in tact.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

A site of pagan worship which still attracts people looking for fairies.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

Museum about life, death, and cannibalism in the Stone Age.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

A modern English garden of eccentric beasts, follies, and oddities.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.