A national monument in Teller County, Colorado, the Florissant Fossil Beds are known for, well, the Florissant fossil beds. Fossilized stumps of a redwood forest litter the site, which is the most prolific source of fossilized insects anywhere in the world.

Top Places in Colorado

Nederland, Colorado

Carousel of Happiness

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

39.9598, -105.5095

Added by royce

Cascade, Colorado

Pikes Peak Summit House

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

38.8153, -105.0557

Added by thomasharper

Nederland, Colorado

Rollins Pass Game Traps

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

39.9359, -105.6710

Added by cyccommute

See more things to do in Colorado »

Located in a mountain valley and operated by the National Park Service, Florissant Fossil is a popular tourist destination because of its exhaustive record of a particular kind of prehistoric life.

The visitors center is filled with fossilized insects on display, complete with background and scientific information. A 14-minute film shown in the center is recommended. It explains that the fossils are contained in the Florissant Formation of Eocene age. Almost 35 million years ago, volcanic eruptions buried the lush valley that was once in this area. Ash petrified the redwood trees — some up to 14 feet wide — that grew here and a lake formed that became a resting place for thousands of plants and insects.

The Florissant Fossil Beds were set aside as part of the National Park System in 1969. The hiking trails are another popular reason for visiting the park; they wind several miles past wonderful outcrops of weathered Pikes Peak granite.