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

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Stalinist skyscraper built with help of cryotechnology.

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

Home of the future Emperors of Russia.

The "Mystery and Company of Merchant Adventurers" is an Elizabethan-era hangout in Moscow.

Former headquarters of the KGB.

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

Gargantuan home of Russian science.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A unique museum dedicated to culture and artistry of carpet weaving.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

Mysterious hillside with a continuously burning natural fire.

A shrine of fire worship built on top of a natural flame.

The ruins of a medieval monastery built on a perilous slope.

Despite producing just a handful of movies, a brave and lyrical filmmaker has an entire museum dedicated to him.

Destruction from Armenia's 1988 earthquake inspired an artist's sculptures of scrap metal.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

A geological oddity topped with a 2,000-year-old pagan temple.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

This small shrine is dedicated to the designer of the first Russian fighter jet and his brother, who became Chairman of the Presidium of the Supreme Soviet.