This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.

One of the highest points in Bexar county offers birdseye views of San Antonio and a four-story stone tower.

On a dusty county road sit the ruins of a ghost town's abandoned church.

Beauty and history abound in this remote West Texas canyon.

Remembering the Alamo with a full-scale replica of the 1836 city.

Life's work of sculptor Elisabet Ney remains preserved in her last studio.

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

Austin’s local mountain isn’t really a mountain at all.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

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

A wacky, UFO-shaped house in a suburban neighborhood.

This unique tower has been home to malaria-fighting bats for 100 years.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

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

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

A stone face watches over the river.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.