fort knox, kentucky, is the site of a u.s. army post but it is even more renowed for the fort knox bullion despository, the massive vault that contains the bulk of the u.s. government's gold deposite. completed in 1936, the valt is housed in a two-story building constructed of granite ; the vault itself is made of steel and has door that weighs more than 20 tons. naturally the most up- to-date security devices available are in place at fort knox and the army post nearby provides further protection