The Nature Conservancy's newest preserve south of Boxley in northwest Arkansas is a haven for endangered bats and other wildlife. We'll take you on a hike through a portion of the 1200-acre tract. A wild cave tour at Cosmic Cavern near Berryville includes two underground lakes, the bottoms of which have never been found. A unique trail in Pine Bluff takes hikers along the world's longest bayou - Bayou Bartholomew, which stretches all the way into Louisiana.