Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Ancient cave tombs known as the "houses of fairies."

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

Mysterious tombstones thought to be remnants of Atlantis.

This mysterious Sardinian festival sees a horde of blank-faced equestrians compete for tin stars.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

During World War II, this rice mill became a Nazi concentration camp.

The walls of this medieval church are covered with perfectly preserved frescos, including a pristine example of the Dance of Death.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Experience what life was like in Ireland during the Viking and medieval ages.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Cat art as far as the eye can see.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.