Final answer:
All three sites, Rocky Mountain National Park, Mesa Verde National Park, and Dinosaur National Monument, are located in Colorado, which is celebrated for its diverse and stunning geological features.
Step-by-step explanation:
Rocky Mountain National Park, Mesa Verde National Park, and Dinosaur National Monument are all located in the state of Colorado. Colorado's landscape is known for its remarkable geologic features. Mesa Verde National Park is famous for its ancestral Puebloan cliff dwellings, like Cliff Palace, which dates from 450 to 1300 CE.
Meanwhile, Dinosaur National Monument showcases an impressive array of fossils due to its location on the Colorado Plateau. Rocky Mountain National Park offers breathtaking mountain scenery and is a product of geological processes, including the Laramide Orogeny, that shaped the Rocky Mountains over millions of years.