The Fort Sill National Historic Landmark, which fills several original stone buildings, explores the history of the fort. Another highlight is the 1872 Post Guardhouse, the center of law enforcement for the Indian Territory. Step inside to see where Apache leader Geronimo was detained on three separate occasions. Geronimo and other Apache warriors were brought here in 1894 as prisoners of war. Geronimo’s grave, marked by an eagle-topped stone pyramid, is on fort grounds a few miles from the guardhouse.
Today, Fort Sill is home to the US Army Field Artillery School. Note that you'll have to fill out a form and pass a background check at the Fort Sill Visitor Control Center before passing through the gates to view the historic sites.