Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

Tel Aviv's popular neighborhood went though endless waves of transformation.

The only quarter of the Old City not dedicated to a major world religion.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

It houses the remains of a 17th-century version of the Titanic.

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

Gargantuan home of Russian science.

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

A scale model of Russia so big visitors are offered binoculars to rent so they can see the whole thing.

Former headquarters of the KGB.

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

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

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

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

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

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.