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

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

The U.S. Air Force has an anti-satellite laser weapon.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.

The world's first commercial spaceport is a disappointment of cosmic proportions.

This is one really big nut.

Home of the International Space Hall of Fame.

A sprawling collection of over 106,000 toys from around the world.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

"I did this all while you were watching TV."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

A museum dedicated to the alleged Roswell Incident.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

It would be a crime to miss it.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

"You don't need a rocket scientist to build a steam engine, but we've got one." -Museum docent on the credentials of a restoration volunteer.

Humboldt's human-powered sculptures race across land and sea for days on end in a wacky quest for dominance.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.