City of Rocks National Reserve is .25 mi. s. on Almo-Elba Rd. and 1 mi. w. on City Rocks Rd., on unpaved roads. Within the 14,407-acre reserve are massive granite rocks, some 2.5 billion years old, eroded into shapes resembling the ruins of an ancient city. Inscriptions written in axle grease and scratched into the rocks by pioneers traversing the Oregon and California trails afford insights into emigrant trail history. Rock climbing, sightseeing and hiking through high deserts are possible.