Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Breathtaking and huge 430 year old maps of Italy.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

One of the world's tallest statues is also one of its most hated.

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

Moscow's imposing monument to the Space Age.

World's largest bell sits on the grounds of the Kremlin in Moscow.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The bomb-ravaged remains of of a colossal Neptune.

Five candy-colored villages on the Italian Riviera.

A lover's walk between hilltop towns, decorated with graffiti love notes.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The Pope’s secret escape route.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

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

A submerged archeological park still holds the wonders of a Roman Sodom.

Pompeii's less famous neighbor is still revealing her secrets.