This ancient Irish landscape boasts hundreds of legendary ruins.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

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

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

100 year tradition of fist fights, marked by marble footsteps.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

One of seven Jewish catacombs in Rome and one of only two open to the public.

The plague quarantine island home to the alleged "Vampire of Venice."

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Architectureal fantasy quarter of Rome.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A remarkably intact castle that once was the largest in Ireland.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.