Originally built as a train station, Union Terminal now houses three separate museums: the Cincinnati History Museum, the Children's Museum, and the Museum of Natural History and Science. Located in Eden Park, the Krohn Conservatory is home to more than 3,500 plant species from around the world − principle collections include a Bonsai Collection, Desert Garden and an Orchid Display. Every spring, thousands of butterflies are let loose in a special themed garden during the annual Butterfly Show. As you might guess from the name, Riverbend Music Center is Cincinnati's main music and event center. The outdoor amphitheater was originally built for the Cincinnati Symphony Orchestra, but it has welcomed musical guests from all genres, including Jimmy Buffett, Aerosmith, Coldplay, Linkin Park, Ingrid Michaelson, Uncle Kracker, and any number of other artists.