An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Southern California’s Theme Park Beginnings.

The famous blue house from the classic horror film "Halloween" is now a local landmark.

Inspiring Earthlings to Boldly Go.

Whiskey lovers, this is your happy place.

A newspaper building that made radio history.

A cobblestone alley with an interesting past.

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

World-famous, Pink's still manages to keep its prized cult fetish status.

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

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

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

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

A one-of-a-kind collection of a unique medium.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

This abandoned Belgian fortress is purposefully being left to nature.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."