Over six months in 1939 and 1940 Wellington hosted the New Zealand Centennial Exhibition, celebrating a century since the signing of the Treaty of Waitangi. Held on 55 acres of land at Rongotai it featured three exhibition courts, grand Art Deco-style edifices and a hugely popular three-acre amusement park. Wellington attracted more than 2.5 million visitors at a time when New Zealand's population was 1.6 million.