I have been in dozens and dozens of caves, some in Arizona and around the U.S. This is a recent picture in the California Caverns, likely the first major cave discovered in California. The thin formations hanging from the ceiling are called soda straws. They are very delicate and easily broken and destroyed. The larger formations on the ceiling are stalactites. the white column in the middle-left is a stalagmite. These photos are taken without a flash using available light. I do not like flash photography.