A house carved into a rock in the 1940s.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The Magical World of George Phar Legler.

Miniature art that tells an enormous story.

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

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

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

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

Steep canyon walls hide a forested oasis in the West Texas desert.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Admire the art and then buy a raccoon skull cleaned by flesh-eating beetles.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

A nostalgic bibliographic gem.

A computer bug so primitive it was an actual insect.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This sinkhole was created by a tragic industrial accident and continues to ravage the surrounding landscape.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.