Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Nicknamed “The Mushroom,” this unique water tower has been featured in several iconic movie scenes.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

2300-year-old Roman road connecting the empire.

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

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

Gods clash with machines in a power plant regenerated as a museum.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

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

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

Architectureal fantasy quarter of Rome.

This medieval city gate is now a blend of the past and the modern world.

This 17th-century passageway is home to numerous bookshops, a witch legend, and the oldest pizzeria in the world.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

A displaced shrine that was put back after a string of bad luck.

Nine Gardens in one—with tea service.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

An alchemist's “magic door” stands in the middle of a Roman park.