The Greek Revival capitol building sits north of downtown on 23rd Street, a pale limestone block topped — only since 2002 — by a 50-metre dome. Inside, the rotunda murals depict scenes from Oklahoma history (the Land Run, the Trail of Tears, the oil boom), the rotating exhibitions in the second-floor corridors are surprisingly good, and the legislative chambers can be visited during the spring session.
Free guided tours run hourly on weekdays. The Hall of Governors on the second floor is a portrait gallery of every Oklahoma governor since statehood. Pair it with a visit to the Oklahoma History Center across the road.