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

Jurassic Park—A Still Life.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A replica that won't float away.

The fifth-longest natural arch in the world, and the longest outside China.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Largest collection of mounted dinosaur specimens in the world.

A tunnel with windows, so you don't miss out on the impressive views.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Dig for your own trilobites in this goldmine of invertebrates.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This quiet park's strange sedimentary spires were named after Kodak's color film.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

Two creeks flow out of either end of this canyon in opposite directions.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

A recreation of an Old West apothecary full of curios.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.