The first declared National Monument in the United States.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

One of the largest private collections of fossils in the world.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The Grand Canyon of Texas.

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

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

An underground city of salt.

An eatery for UFO seekers on the Extraterrestrial Highway.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A picturesque (all-natural!) beach in a landlocked state.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

One of the few slot canyons in New Mexico, this area is fantastic for hiking, camping, and stargazing.

This 1950s-era nostalgic roadside New Mexico attraction consists of a quirky curio store and museum embedded into the face of a cave.

Home of the International Space Hall of Fame.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.