The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

The highest point in Texas is capped by a big silver pyramid.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This old abandoned sign flickers to announce a motel that isn't even there.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

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

Mysterious glowing orbs float through the desert night.

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

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

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

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

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

Some islands... they come, they go, especially on Lake Travis.

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

Free public park and gardens filled with peacocks and peahens.

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

The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

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

This small stone building, the final work of a renowned artist, offers a peaceful environment with radiant, colorful glass windows .

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