Travelers exchange letters with woodland creatures at this mini post office.

Once the gateway to the utopian dream-village of a Civil War embalmer.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

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

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

This infamous prison has a store where you can buy goods crafted by incarcerated people.

Of all the origin stories for weed's secret code, this one likely has the goods.

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

Frank Lloyd Wright died a year before construction on his largest public project even began.

Junkbots and mud babies are the masterpieces in this fantastically sci-fi art museum.

Giant jewel-toned statues fill the grounds of this Cambodian Buddhist temple in California.

Semi-recognized center of the world, with many oddities.

Ancient human, animal, and geometric figures drawn in the earth.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

Decommissioned experimental solar facilities that pioneered solar energy technology.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Nationwide network of co-ownership underground catastrophe shelters.

Where NASA's satellites and rovers phone home.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

One of the last free public hot springs is decorated with hippie art.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.