A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

This archaeological site built into a tuff outcrop is filled with rock dwellings, the ruins of a medieval castle, and a necropolis.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

This network of roads is one of the most unique Etruscan creations ever discovered.

A magnificent Neogothic tomb hides within this Italian fairytale-like forest.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

The ruins of a hermitage constructed during the 12th century.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Estimated to be more than 5,000 years old, this yew may be Britain’s oldest.

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

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

The mummified relic of St. Antoninus.

This curious, round temple is the oldest still-standing marble building in Rome.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

Renaissance villa and gardens complete with a tormented colossus.