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

A spring-fed pool so deep it's used for scuba diving as well as swimming.

Three hundred years of preserved Spanish colonial history in San Antonio.

A 131-year-old wunderkammer of Texas history.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

These boots are made for selfies.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

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

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

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.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

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

It was once the base for a series of domestic terror attacks.

An overlooked memorial honoring the local Washington residents who died in World War I.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Washington's iconic carousel has a nice piece of Civil Rights history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Fittingly, America's museum of architecture is itself a magnificently designed old building.