Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

A world-class observatory in the California desert.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

It houses the remains of a 17th-century version of the Titanic.

The prototype for all Nazi concentration camps.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The "lovely red Vega" of the legendary record-settling pilot.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

Towering basalt columns, a creation of fire and ice.

Quite simply the largest tree in the world (by volume).

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."