No matter how many forts you've seen in your Texas travels, this one is likely to be a highlight. Many folks claim it's the best-preserved Western frontier fort in the US, and much of it has been restored by the city over the decades.
Designed to protect settlers and people moving west on the overland trails, the fort went up in 1867 on the fringes of the Texas frontier and saw service until 1889. Among its highlights are the Headquarters Building, which includes the Fort Concho Museum, and the Post Hospital.