Inside this building is another country within Rome, a sovereign entity without a physical territory.

This ancient Roman arch misled treasure hunters for centuries.

According to local folklore, this Roman sepulcher was once a throne for the Devil.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

This 19th-century aqueduct provides insights into how water was supplied to Victoria on the island of Gozo before modern plumbing.

The deadliest diving spot in the world is also a stunning geological marvel.

This concrete memorial commemorates a group of brave locals who saved the crew and passengers of a wrecked ship.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

An 800-year-old island castle in Guernsey's main harbor.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

Single runway interrupted by a busy road that cuts across its middle.

In one of the world's smallest countries, a royal's personal winery is open to the public.

Legend holds that St. Paul was flogged for preaching Christianity at this pillar.

This sea stack in Cyprus is traditionally seen as the birthplace of the goddess Aphrodite.

This no man's land slicing through the island is strewn with abandoned relics of another time.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

For over two centuries, this palace served as a residence for the Holy Roman Inquisition's leaders, a courthouse, and a prison.

People have been making salt here using traditional methods for centuries.

Despite the name, these small saltwater swimming pools have nothing to do with the Romans.