Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The topiary maze at the Habsburg hunting lodge.

The final resting place for the remains of 143 Habsburg royalty.

Ukrainian defense contractor's center for studying "pyramid energy."

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.

300-year-old villagers houses and traditional churches preserve a nearly lost piece of Russian history.

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

Gargantuan home of Russian science.

A 360 degree battlefield experience.

Stalinist skyscraper built with help of cryotechnology.

The tallest hotel in Europe.

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

Dozens of padlock-trees along the Moscow River.

Moscow's imposing monument to the Space Age.

Former headquarters of the KGB.

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

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

The history and future of cannabis.