The Oklahoma State Capitol was considered finished in 1917. However, part of the original design was not built for another 85 years: the dome. The building cost $1.5 million yet the dome cost almost $21 million. This limestone plus gray and pink granite, Beaux Arts building with mythological stone lions on the roof has the distinction of being the only capitol built on an active oil field. Oklahoma became the 46th state on November 16, 1907.