Pi3.124 on Wikimedia Commons

Old Fort Belknap Powder Magazine. Best preserved of the original structures at Fort Belknap. The Fort, named for its builder, Brig. Gen. W. G. Belknap (1794-1851), was one of the frontier posts placed by the Federal government along a line from the Red River to the Rio Grande to guard settlers from Indians, soon after Texas joined the Union. This was one of 9 stone and 7 picket houses on the site by 1853. Restored by the State of Texas in 1936. (Recorded Texas Historic Landmark-1962.) #3729