Local legend says the remains of Father Christmas lie within the medieval grounds.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Huge standing stones mark a site of megalithic mystery.

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

The largest stone circle in Ireland.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The remains of a 13th-century Franciscan friary have survived multiple attempts at destruction, most recently in 1921.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

The final resting place of the poets Shelley and Keats.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

A fairy tale castle in modern Rome.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

A forgotten "city of water" underneath the famous Trevi district.

Architectural monsters are devouring this palace's every door and window.

A Nesting Doll of Churches.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

An alchemist's "magic door" stands in the middle of a Roman park.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.