Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

One of the last examples of Soviet architectural propaganda has a few technological tricks up its sleeve.

This massive monument honors the first human in space.

Former estate of Lenin, now home to his death mask.

Gargantuan home of Russian science.

A 360 degree battlefield experience.

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

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

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

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

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

Former headquarters of the KGB.

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.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

A section of the long chain that blocked enemy ships from entering Constantinople.

The ancient latrines of the Greeks, in all their public glory.

This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.