Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

A mysterious monument covered in a binary code marks the heart of tech.

The oldest house in the capital of Silicon Valley.

This 252 step staircase offers stunning views of San Jose.

Tucked away behind an unassuming set of shops is a must-see series of stunning murals.

Anyone can control this glittery light installation with just a phone call.

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

The tallest bridge in California was constructed for a project that was eventually cancelled.

Anza led the first Spanish settlers from Mexico to Monterey, California in the 1770s.

This massive statue of John Muir on the side of a California highway was carved from a redwood tree.

His discovery kicked off the Gold Rush. One of the hands on this commemorative statue points to the spot where he found the precious metal.

This massive redwood tree has stood in Northern California for nearly 2,000 years.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

A historic train ride from California to Mexico.

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

A collection of anti-communist sculptures stands watch in the Mojave Desert.

After the nearby mercury mine shut down, this town was abandoned and declared a Superfund site.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A hidden courtyard houses early 20th-century plaster masterpieces.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

This lonesome Monterey cypress has survived centuries of wind, salt, and at least one attempt at arson.

The same family lived in this Victorian house for nearly 100 years without altering the building.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.