A unique sculpture designed to outline humanity's reliance on oil.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

This one-time health resort was used by aristocrats around the world.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

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

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

This ancient market is often referred to as the oldest shopping mall in the world.

The final resting place of the poets Shelley and Keats.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

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

This statue is the only female representation of Rome's "talking statues."

A massive marble foot is tucked away in a small alley near the Pantheon.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

2300-year-old Roman road connecting the empire.

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

Gargoyle head that brings good luck.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

A tile mosaic displaying a saying from the prophet Muhammad presents the mission of Durham University's Oriental Museum.

Despite its location in the English countryside, this chapel is the property of Ontario, Canada.