The city has two major hospitals which serve the Four States region, Freeman Health System and Mercy Hospital Joplin, the latter replacing St. John's Regional Medical Center which was destroyed in the May 22, 2011, tornado. Freeman Hospital East and Landmark Hospital serve more specialized community health needs. The city's park system has nearly and includes a golf course, three swimming pools, of walking/biking trails, the world's largest remaining globally unique Chert Glades and Missouri's first Audubon Nature Center located in Wildcat Park. A waterfall, Grand Falls, the highest continuously flowing in the state, is on Shoal Creek on the southern end of the city. Included in Schifferdecker Park is the Everett J. Ritchie Tri-State Mineral Museum and Dorothea B. Hoover Historical Museum, which holds a significant collection of minerals from the era of lead and zinc mining in the region.