In addition to the parks within Denver, the city acquired land for mountain parks starting in the 1911s. Over the years, Denver has acquired, built and maintained approximately of mountain parks, including Red Rocks Park, which is known for its scenery and musical history revolving around the unique Red Rocks Amphitheatre. Denver also owns the mountain on which the Winter Park Resort ski area operates in Grand County, west of Denver. City parks are important places for Denverites and visitors, inciting controversy with every change. Denver continues to grow its park system with the development of many new parks along the Platte River through the city, and with Central Park and Bluff Lake Nature Center in the Central Park neighborhood redevelopment. All of these parks are important gathering places for residents and allow what was once a dry plain to be lush, active, and green. Denver is also home to a large network of public community gardens, most of which are managed by Denver Urban Gardens, a non-profit organization.