It was once the base for a series of domestic terror attacks.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

The walls, tables, and much of the ceiling in this pizzeria are covered with $40,000 in $1 bills.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

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

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

This is the oldest Roman-made bridge in the city still existing in its original state.

Crispy, cheesy rice balls—the Roman answer to arancini—take center stage here.

The mystic whose incorrupt corpse still attracts the faithful.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

Rome’s legendary peephole vista is also a former Crusader stronghold.