The Russell Cave National Monument is a U.S. National Monument located near the town of Bridgeport. The Monument was established on May 11, 1961. The park is comprised of 310 acres and offers activities including hiking, birding and picnicking. The visitor center offers a historical museum for the area. The National Monument was listed on the National Register of Historic Places on October 15, 1966.
Russell Cave is the third longest mapped cave in Alabama, is ranked 90th on the United States Long Cave List. At a length of 7.2 miles is currently listed as number 314 on the World Long Cave List. Its exceptionally large main entrance was used as a shelter by prehistoric Indians from the earliest known human settlement in the southeastern United States, through to European colonization. The surrounding forest provided food, tools, and wood fuel for fires.
You can learn more about the park on their website or at Wikipedia.