Meramec Caverns is the collective name for a 4.6-mile (7.4 km) cavern system in the Ozarks, near Stanton, Missouri.[1] The caverns were formed from the erosion of large limestone deposits over millions of years. Pre-ColumbianNative American artifacts have been found in the caverns. Currently the cavern system is a tourist attraction, with more than fifty billboards along Interstate 44[2] and is considered one of the primary attractions along former U.S. Highway 66.[3][4] Meramec Caverns is the most-visited cave in Missouri with some 150,000 visitors annually.[5] Meramec Caverns is ranked #178 on CaverBob.com's USA Long Cave list.[1]