Caddo Lake National Wildlife Refuge

Sitting on the Texas-Louisiana border, this National Wildlife Refuge lived quite a life before becoming a national refuge. In the 19th century, the area was heavily sought after because of its nutrient dense soil that supported cotton plants. During World War II, the area was transformed into the Longhorn Army Ammunition Plant, which manufactured TNT. In the early 2000s, the established traded its booms for birds and became a wildlife refuge.