Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

An artificial crater field that trained astronauts for lunar exploration.

This historic national park is covered in the stunning ruins of red rock pueblos.

The cinder cone volcano with a less than complimentary name.

This Native American settlement dates back to the Pueblo II period.

This small interfaith chapel lies not far from the rim of the Grand Canyon.

The remnants of a creative early method of wildfire prevention.

The Grand Canyon’s original airport, which once welcomed pilots like Amelia Earhart and Charles Lindbergh, lies abandoned.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A living time capsule of the 1960s Richardson Bay water-front.

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

In 1998, Larry Page and Sergey Brin briefly ran their fledgling company from this Silicon Valley garage.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

At this local mall, visitors are ushered through a 1940s jail exhibit.

Eight huge lanterns lining a city street can change color on command.

A sculpture dedicated to Napa Valley's oldest mineral water company.

800 apricot trees honor Silicon Valley's agricultural history.

California's longest-running tourist attraction is a stump.

At night, this glittering musical tunnel draws skaters and photographers.

A 90-acre park on former landfill that hosts an annual kite festival.