The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

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

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The world's last remaining store of its kind.

The longest continuous lava tube in Oregon.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

A collection of colorful dinosaurs hidden in an actual rainforest.

This large maar crater in Oregon is the bigger brother to Hole in the Ground.

Massive crater in central Oregon.

Treehouse motel and treehouse-building school.

This extinct shield volcano is the lightning rod of the Cascades.

The victims of a free-floating Japanese bombing during WWII are remembered by this stone monument.

A public fountain that spouts "health water" from a nearby spring.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.

A popular tourist cave with a dark past.

An old-timey medicine shop that once served Chinese laborers during the Gold Rush is still open for business to this day.

A series of 33 stone markers maps an ancient 55-mile transportation route.

Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.