Stock photography, photos: Opera In A Cave-Springfield, MO Stock photos of Fantastic Caverns near Springfield, Missouri served as an opera house for the Springfield Regional Opera one summer. The naturally air conditioned cave's main cavern provide great acoustics and was large enough to seat a full orchestra (at the left), the set, and 200-300 people. Photograph: © John Stewart Click for a larger image and more information Keywords associated with this stock photo: Springfield Missouri, Ozarks, cave, cavern, Opera, performance, acoustics, sound, Missouri, natural air conditioning, underground, acting, stage performance, summer, dark,