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

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

Jesus' footprints and the first catacombs in the world.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

A tiny church on a man-made island in the Adriatic.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Ozymandias’ time-keeping temple.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

An abandoned saucer-shaped monument in the Bulgarian mountains.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

In this town's main square resides a statue of none other than the 43rd President of the United States.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

The hallucinogenic center of the ancient world.

Gargoyle head that brings good luck.

An ancient knight and a symbol of the city's freedom.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.