The cave inside the Arizona-Sonora Desert Museum looks so real that I thought it is similar to the Luray Cavern formation. Then, I realized that it is really next to impossible to have this amount of seeping groundwater to form this Stalactites and Stalagmites in this dry desert environment. So a little research at the visitors center revealed that artificial rock in the cave was created by air pressure to shoot shotcrete onto a metal framework of reinforced rods. They look very real and indistinguishable from the original rocks of Luray cavern in Virginia. The spectacular exhibit was actually hand built by a talented team.