Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Oldest building in California still in use.

What began as an illegal art installation has become a symbol for unity, ocean awareness, and coastline preservation.

A futuristic-looking beach house built for the owner of a snack food brand.

A mosaic map made of over 100,000 tiles depicts the geological features and sea creatures that live along this San Diego beachside community.

One of the largest trees of its kind in California.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

A magnificent, reportedly haunted mansion built for a composer by Spiritualists.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

This San Diego museum, housed in a former Navy training facility, is dedicated to preserving women’s historic achievements.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

An ode to the friendship between four Pacific Rim countries.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

These hilltop ruins of a forgotten Buddhist monastery flourished in Antiquity from trade with the Roman Empire.

A World War II battle site made famous by one man's heroic actions.

The seat of the lost Ryukyu Kingdom has survived numerous fires and wars over the centuries.

There’s a hidden military meme engraved on the World War II Memorial.

An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Decades before the scandal, this staircase on the river was a literal "water gate."