An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A small sculpture garden that provides a microcosmic representation of California.

A Biblically-based Natural History Museum.

This enormous World War II relic is one of the largest wooden structures in the world.

World's first "penitentiary," meant to be humane, drove men insane.

Unrepaired walls from a 1920 anarchist bomb attack.

An old town theater converted into a celebration of the hobo legacy.

Ever wanted to can Spam?

An ancient Viking village in North America that predates Columbus by 500 years.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

An inconspicuous footbridge beloved by San Diego locals.

A couple turned their front yard into an artistic masterpiece.

An ode to the friendship between four Pacific Rim countries.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

One of the American Southwest's most extensive collections of Navajo rock art.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

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

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."