These little castles each held thousands of pigeons.

Ancient structures used to make and preserve ice in the deserts of Persia.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

The tallest hotel in Europe.

Back in the tiny USSR.

Gargantuan home of Russian science.

It took over half a century but a Russian monument to a famous and tragic space pup finally stands in Moscow.

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

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

Legends of time travel and magical woodland creatures bolster the natural charm of this verdant sanctuary in the midst of Moscow.

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

A 360 degree battlefield experience.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Moscow's imposing monument to the Space Age.

Museum celebrating the achievements of the Soviet space program.

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

Dozens of padlock-trees along the Moscow River.

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

Ancient burial grounds of the wealthy.

The second oldest anatomical theater is housed in a museum of curiosities.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

Early habitat dioramas and home of the elusive gaff, the skvader.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.