The city originally developed as a castle town during the Edo Period (1603-1867). Okayama Castle, the Koraku-en Garden (one of the three major gardens in Japan), and a number of art museums and science museums are found here. Okayama Castle was built in the 16th century. The castle tower has been rebuilt, but the Tsukimi-yagura turret and other structures are original. The Koraku-en Garden, which took 14 years to complete in the 17th century, was the first lawn garden in Japan. The garden is 133,000 square meters, and visitors can view Okayama Castle.