The Tower Building of the Little Rock Arsenal, also known as U.S. Arsenal Building, is a building located in MacArthur Park in downtown Little Rock, Arkansas. Built in 1840, it was part of Little Rock's first military installation. Since its decommissioning, The Tower Building has housed two museums. It was home to the Arkansas Museum of Natural History and Antiquities from 1942 to 1997 and the MacArthur Museum of Arkansas Military History since 2001. It has also been the headquarters of the Little Rock Æsthetic Club since 1894.