An abandoned Cold War missile radar site.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

This Italian foot path winds through the mountains via 52 individual tunnels.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

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

An Italian hillside ghost town.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

Historic medieval fortified city in southwest France.

An ancient Egyptian temple in the middle of Madrid, Spain.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

Breathtaking and huge 430 year old maps of Italy.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

This Italian church is as beautiful as it is common, except for the real skulls decorating the many mannequins inside.

A modest museum in the final home of Italian poet and father of modern Italian, Francesco Petrarca.

The home of a neoclassical master is now a shrine to his chosen art style.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.