The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An unusual abandoned church damaged in World War II sits in a small village outside Moscow.

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

The avant-garde design was able to bypass strict Soviet regulations on architecture.

Home of the future Emperors of Russia.

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

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

This artificial cave looks like something out of a fairytale.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

Village of slate houses, built on a white marble outcrop.

For centuries, Jeddah’s old town was a major trading port and a point of entry for Hajj pilgrims traveling by sea.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

The rocks around this mountain are filled with so many carvings that the area became known as the "open library."

An unfinished tomb carved into a giant boulder in the Arabian Desert.

An abandoned horror film set sits eerily along a highway through Hollywood's "door to the desert."

A fortified city, home to a remaining population of five families

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

This vast masterpiece of Moroccan architecture spreads across 20 acres.