Secret US military film studio in the Hollywood Hills.

This stockpile of junked electronic and mechanical gadgets is a favorite among Hollywood prop masters.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

A deserted hodgepodge of experimental structures designed by nearby university students.

An optical illusion found amid a logged redwood forest.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

A regular looking rock with an unbelievable history.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

San Francisco Bay's ghost town.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

The largest permanent Monopoly board makes one of the longest games even bigger.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

If you fly into Edinburgh Airport, it's possible to spot this prehistoric site without even getting off the plane.

Large-scale contemporary artworks tower over fields and lurk in forests around a Jacobean manor house.

In the 18th century, the Earl of Buchan mapped the universe on this stone pillar.

This unassuming stone is possibly the oldest Scottish memorial to the 13th-century knight.

This remote camping site offers incredible stargazing opportunities.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

This sundial indicates the time based on where you stand within it.

A strange sandstone formation in the middle of nowhere presents an interesting climbing opportunity.

A rare memento of a lost Indigenous group.