In 1907, Spokane's board of park commissioners retained the services of the Olmsted Brothers to draw up a plan for Spokane's parks. Much of Spokane's park land was acquired by the city prior to World War I, establishing it early on as a leader among Western cities in the development of a citywide park system. Spokane has a system of over 87 parks totaling and includes six neighborhood aquatic centers. Some of the most notable parks in Spokane's system are Riverfront Park, Manito Park and Botanical Gardens, Riverside State Park, Mount Spokane State Park, Saint Michael's Mission State Park, Plantes Ferry Recreation Park, John A. Finch Arboretum, and the Dishman Hills Conservation Area.