2 Best Sights in Cody, Sheridan, and Northern Wyoming, Wyoming

A ring of rocks 75 feet in diameter, this ancient site is the best preserved of nearly 150 Native American stone wheels found in Wyoming, South Dakota, Montana, Alberta, and Saskatchewan. Evidence such as the 28 spokes (one for each day of the lunar cycle) leading from the edge of the wheel to a central cairn has persuaded some that the wheel was an ancient spiritual observatory much like England's Stonehenge may have been. To protect the area, access to the wheel is restricted to foot travel; it's a 1½-mile hike on a well-maintained unpaved road to the site from the parking lot (people with disabilities may drive to the site). Up in the Big Horn Mountains, at an elevation of 9,642 feet, the site affords views of the entire Big Horn Basin. Dress warmly, as it's cool up here, even in summer.

A few miles east of Glendo State Park lies a vast stone quarry initially mistaken for the work of early Spanish explorers. Archaeologists later determined the site, known as the Spanish Diggings, to be the work of various indigenous tribes on and off for the past several thousand years. Tools and arrowheads carved from the stone quarried here, including quartzite, jasper, and agate, have been found as far away as the Ohio River valley. To see the diggings you'll have to drive through Glendo State Park.