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

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

Resting place of the Texas A&M canine mascots, who watch the game from the grave with their own miniature scoreboard.

A prison-like structure guards the remains of a notorious Old West outlaw.

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

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

Search for traces of the dinosaurs that roamed here more than 90 million years ago.

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

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

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.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

This mountain tram provides stunning views while hanging from a single, steel thread.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The magic's in the hole!

Two massive rock outcroppings on the Oregon coastline.

The highest peak in the state of Vermont has some interesting features.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.