The ghostly remains of an accidental sea.

The only theatre in the world constructed specifically for sound movement.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A clear blue swimming hole with hidden caves, still unexplored.

Take a monster truck tour around an ostrich farm in the middle of the desert.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

A mysterious "wedding cake" castle in the middle of the urban desert.

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