South Twin Sisters Road

Twin Sisters begins at Register Rock and traverses a broad valley, passing two massive granite monoliths that give the road its name. Though the huge outcroppings are close together, they were formed millions of years apart before being thrust up through the earth's crust. Thus, they are hardly twins, but the name has stuck nonetheless.

Between 1845 and 1869, the California Trail saw over 250,000 easterners moving westward in search of the promised riches of the California Gold Rush. The California Trail ran through what is now the City of Rocks National Reserve, where wagon ruts are still visible beside the road today. The emigrants named the place Pyramid Valley for the pointed spires surrounding the lush central valley, a favorite camping location along the trail. A few travelers even wrote their names in axle grease on Register Rock, many of which are still visible today.

Camping in the City of Rocks Reserve is limited to designated campsites, which must be reserved. Four small walk-in tent sites and a group site sit near the Twins. Nearby Smokey Mountain Campground sits in a large juniper and pinion forest, offering 38 campsites with RV hookups. The small town of Almo hosts the Visitor Center, a small general store with a gas pump, two restaurants, and numerous commercial campgrounds.