What looks like a link in Gondor's early warning system is actually a centuries-old Italian fortress.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

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

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

According to the legend, this structure was built in a single night with the help of the devil.

It's believed that these columns marked the end of the Via Appia.

An impressive bridge over a ravine also served as an aqueduct.

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

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

The oldest-known example of a historic architectural style recognized by UNESCO.

This uniquely designed bridge served as the city gate for Comacchio.

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

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

A 2,000-year-old engineering wonder hides beneath an Italian town.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

For decades, vendors have sold clothes once worn by American soldiers who stormed Italy in the 1940s.

The oldest volcanology research center in the world.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

A dead saint, a deadly poison, and a mysterious holy ooze.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.