Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

A rotting air force base is now home to rare birds and scarce plants.

The oldest of the three remaining bridges in England with buildings on top of them.

Modern commuters still pass through this 2,000-year-old Roman archway.

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

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

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

Dozens of padlock-trees along the Moscow River.

The tallest hotel in Europe.

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

Moscow's imposing monument to the Space Age.

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

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

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

Gargantuan home of Russian science.

Stalinist skyscraper built with help of cryotechnology.

Home of the future Emperors of Russia.

Former headquarters of the KGB.