A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A walk through the historic city center, under the streets of Seattle.

Get up close and personal with these majestic fish.

This legendary urban waterfall creates a dazzling display of rainbows.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Built in 1906, this unique building was the first Hindu temple in the United States.

San Francisco’s century-old Christmas Tree.

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

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

These subterranean storage areas hold emergency water reserves.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Early prototype for Frank Lloyd Wright's Guggenheim.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

340 bicycles, 65 feet high.

Hand-powered race of alternative forms of transportation.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.