Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The topiary maze at the Habsburg hunting lodge.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

A seaside castle complex that stood through centuries of conquests.

This megalithic tomb was crafted by a mysterious civilization that settled the island of Pantelleria.

According to a local legend, this bridge was constructed by an astrologer with the help of the devil.

A Roman calendar dating to the first century is tucked away in a small town alley.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

A perfectly preserved example of a fortified Medieval ricetto.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

These caves are home to a small church and were used to age cheese.

The ruins of this medieval castle now stand as a monument against all wars.

An enormous sinkhole that local lore attributes to the anger of the Virgin Mary.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

Its look is severe, but its location, isolated on a hill in the middle of the countryside, is particularly scenic.

The origins of a large, medieval castle are shrouded in mystery, but now it's a delightful garden.

A mountain cave is the site of archaeological findings and Paleolithic rock art.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

A small thermal park among the mountains of Southern Italy features a surprising piece of modern art.