Frontier Army Museum

Still an active Army post but unlike any other I’ve seen,  Fort Leavenworth is worth a visit (although in our post-9/11 world it’s kind of a hassle to win admittance). The old officers’ quarters on the bluffs above the Missouri date from the 1880s and ’90s, and the Frontier Army Museum has a great collection tracing Army history in the West from the fort’s establishment in the 1820s to Pershing’s expedition into Mexico in 1916.