The largest source of fossilized insects anywhere.

This super steep hike ascends 2,000 feet in less than a mile.

There are eight natural springs around town, each with a slightly different taste.

A lively annual event in which thousands of people race to push coffins heavy with bodies up a hill.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

This abandoned prison castle has become an imposing gallery of graffiti art.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The man who was president for only one day and spent most of it asleep.

Roadside attraction with more than 1,000 stuffed and mounted animal skins displayed in simulated natural habitats with hand-painted backdrops.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

The only international border marker within the United States.

See the sky in a new way through this art installation.

The end of times arrives, at least for the fish in the O.C. Fisher Reservoir.

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

"They died with their boots on."

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

This underwater old Texas hill town only resurfaces during harsh drought.

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

Two small markers remember the Alamo's feline protectors.

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

A popular swimming hole that hides one of America's most deadly diving spots.

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