The first safe in this California town had to hold all the gold.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This municipal playground was co-created by the father of one of the most playful characters ever.

This remarkably simple jail went over a century without an escape.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

A flooded Mexican cave that hides a river beneath the water.

Few of the many visitors to this resort town know of its hidden Maya ruins.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

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 historic graveyard was partially paved over to create a streetcar line.

San Diego's most historic and haunted home.

The neighborhood of Eagle Rock is named after a gigantic boulder with a shadowy surprise.

Formerly Fire Station No. 27, the museum is a hidden gem in the heart of Hollywood.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.