Mysterious glowing orbs float through the desert night.

An emerald-green grotto just a short trip from Austin.

A modernist landscape of water and sci-fi concrete.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Controversially claiming the title of world's biggest bass drum, UT's Big Bertha was once made radioactive by the Manhattan Project.

A high-octane shrine to the greatest Texans who ever lived.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

To honor a beloved Austin radio DJ a neighborhood bridge has been covered in a loving mosaic.

A view-altering observatory at the University of Texas.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Free public park and gardens filled with peacocks and peahens.

A grove of colossal man-made flowers built to collect the sun's rays.

This failed condo development was reborn as a street art hub.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

The only castle in North America to ever house European sovereigns.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Guns that have been defending San Francisco since 1904.

This private residence was the template for one of the most beloved television homes of all time.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.