This massive redwood tree has a hole in the base big enough to drive through.

An abandoned boat that's been stranded mysteriously for decades.

A replica of the first public theater built in California.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A bronze tribute to a legendary Californian, the self-proclaimed "Emperor of the United States."

This 19th-century museum inside of a lighthouse is only accessible during low tide.

Here, visitors can swing with the waves of the Pacific Ocean.

800 apricot trees honor Silicon Valley's agricultural history.

Art Deco stylings conceal the true nature of this bridge.

It took years to decode its mysterious messages.

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.

Founded in 1873 to support the needs of the gold mines flourishing nearby, this is the last water-powered foundry in the United States.

For almost 100 years, this site of peace and spirituality has existed on the California coast.

America's oldest Italian restaurant is a San Francisco institution.

A plaque and memorabilia collection mark where A&W got its start.

One of the oldest adobe structures in Northern California.

The oldest dim sum restaurant in the United States is a nostalgic jewel.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

This hiking/biking/horse trail along an old railroad grade features trestles, tunnels, and a roadless stretch through the scenic Susan River canyon.

California's longest-running tourist attraction is a stump.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.