The Zilker Botanical Garden is a botanical garden of varied topography located on the south bank of the Colorado River at 2220 Barton Springs Road, near downtown Austin, Texas, United States. Theme gardens include the Taniguchi Japanese Garden, The Riparian Streambed, The Hartman Prehistoric Garden, and The Mabel Davis Rose Garden. The Botanical Garden was established as a non-profit organization in 1955, and is the centerpiece of Zilker Park.