A tunnel with windows, so you don't miss out on the impressive views.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

This stone windmill marks an old, mysterious homestead in what is now central Austin.

This massive oak tree has ties to the first native tribes of the region and the founders of Texas.

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

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

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

A former electrical substation is now home to an eccentric junk art masterpiece.

Free public park and gardens filled with peacocks and peahens.

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

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

A colorful public mural in San Antonio's West Side encourages students to stay in school.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

San Antonio's first 3-D stereoscopic mural is a trippy treat for the eyes.

Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

The 40-foot-tall votive candle is the largest of its kind.

A priceless work of art created by the saint's own blood sister hangs in a San Antonio basilica.

The cremains of those who donated their bodies to science are buried in a tiny cemetery behind the building.

These boots are made for selfies.

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

Two small markers remember the Alamo's feline protectors.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

This big empty pig is a nostalgic throwback to mid-20th-century Texas barbecue.