 In 1934, during the Great Depression, the Civilian Conservation Corps built a stone monument to hold the chain.Another attraction at the park is the "Lady Polk", the remains of a giant experimental cannon named for Polk's wife.At long and 15,000 pounds, the imposing gun bombarded Ulysses S. Grant's troops at the Battle of Belmont with 128-pound conical projectiles that it could fire up to three miles (5 km).