We stood in the thick darkness deep in the earth, only feet away from an underground river. We knew the water was flowing, but the surface was still and there was no sound. Normally, I don't descend into the depths of the earth any deeper than the cellar. But earlier this month, when my friend Regina arranged for us to visit Alexander Caverns in the Kishacoquillas Valley, I was an enthusiastic proponent. "It's on a Nebraska Amish farm," Regina told us. "They don't have phones, but I … [Read more...] about Alexander Caverns