You don’t go to Andros, Bahamas for the night life or casinos or shopping.  You go because of its natural beauty, the beaches, the wildlife, the wetlands, and the third largest barrier reef in the world. If you like to explore the natural environment, Andros is for you. One of the most interesting natural features of Andros are its blue holes.  Blue holes are vertical caves, formed by the slow erosion of the limestone bedrock of the island from acidic rainwater trickling through crevices in the limestone.  Andros has the highest concentration of blue holes in the world, over 220 total, some inland, and some oceanic. In 1971, the famous…