This ancient stone bridge is a hub for daredevils.

This former monument to an invented Iraqi victory was turned into a military camp during the subsequent invasion.

A bloody history is captured in this former prison turned museum.

This remnant of an ancient Persian city is considered to be the world's largest single-span brick vault arch.

A giant bisected onion dome remembers the Iraqis who died in the Iran-Iraq War.

Giant reed houses made in the marshes of Southern Iraq.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The sacred shrine of the Yazidis.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

One time home to turn of the century explosives, now hidden under the Bay Bridge.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

Masterful ceramic fountain and map of the Pacific Basin.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

The only visible piece of San Francisco's most famous shipwreck.

A psychedelic labyrinth on the San Francisco bay.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The only theatre in the world constructed specifically for sound movement.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.