3 Best Sights in Cheyenne, Laramie, and Southern Wyoming, Wyoming

A unique concentration of creatures is embedded in the natural limestone outcrop at Fossil Butte National Monument, indicating clearly that this area was a freshwater lake more than 50 million years ago. Many of the fossils—which include fish, insects, and plants—are remarkably clear and detailed. Pronghorn, coyotes, prairie dogs, and other mammals find shelter within the 8,198-acre park, along with numerous birds, such as eagles and falcons. You can hike two trails and unwind at the picnic area. A visitor center here houses an information desk and fossil exhibits, including a 13-foot crocodilian, long since extinct but related to the modern crocodile.

The second-largest active sand dune field in the world, these otherworldly mountains and valleys of sand stretch for more than 100 miles. Pay attention to signage: some areas are friendly to off-roading, while others are federally protected and do not allow motorized vehicles. The ADA-accessible Killpecker Sand Dunes Open Play Area Campground is located 32 miles north of Rock Springs and has a vault toilet and fire rings.

The Vedauwoo Recreation Area, in the Medicine Bow–Routt National Forest, is a particularly unusual area and a great place for a picnic. Springing out of high plains and open meadows are glacial remnants in the form of huge granite boulders piled skyward with reckless abandon. These one-of-a-kind rock formations, dreamscapes of gray stone, are great for hiking, climbing, and photography. There's also camping here.