Welcome to Rocky Mountain Arsenal National Wildlife Refuge, it's FREE to visit! Located just 10 miles northeast of downtown Denver, you can step into nature and see the native wildlife that call the Refuge home. Bison, deer, raptors, songbirds, waterfowl, prairie dogs, and coyotes are just a few of the animals you will see on your visit. Take a nature escape and discover the variety of wildlife and outdoor recreational experiences waiting for you.