This large, circular tomb is the final resting place of the first emperor of Rome.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A Nesting Doll of Churches.

The Pope’s secret escape route.

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

Crushed coral and crystals give the sand its signature coloration.

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A collection of objects supposedly singed by the hands of souls in purgatory.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

Stalactites and stalagmites in a beautifully lit cave.

Thousands of well-dressed mummies below a monastery.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

One man's attempt to stay one step ahead of the church.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

Inside a London bookstore, a fireplace that once belonged to the illustrator responsible for a famous set of tarot cards.

At almost 1,000 years old, this is the oldest known door in all of Britain.

Cathedral-like Victorian vaults are hidden within this iconic bridge.

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

The beautiful baroque library of the Hapsburg empire.

This museum offers a journey back to the Belle Epoque era of Romania.

This 11th-century structure is one of the oldest churches in Romania.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.