Outside just put out a list of the Most Underrated Parks in each state and in Colorado, they named Black Canyon of the Gunnison National Park.
According to the National Parks Service:
Big enough to be overwhelming, still intimate enough to feel the pulse of time, Black Canyon of the Gunnison National Park exposes you to some of the steepest cliffs, oldest rock, and craggiest spires in North America.
Fewer than 298,000 people visited the park in 2022 and out of 63 parks in the country, Black Canyon of the Gunnison ranked 48th.