National Geographic : 1938 Jul
U National uteograpnc Society Dufaycolor Photograph byWillard R.Culver SEEPING WATER DEPOSITED THE MINERALS THAT FORM THE DRAPERIES OF THIS CAVERN MURAL Iron-stained surfaces are brown and orange; pure calcite formations are lighter, often snowy white. Stalactites areusually hollow, like soda straws, and grow downward. Stalagmites are solid and build upward; those the child is looking at in Endless Caverns may beaninch higher when thechild is 70. Other well-developed limestone caves like this are open to visitors all year in the Shenandoah ValleyofVirginia.