This essay examines museums of Natural History, Science and History, as centers of interpretation, research, education and social activities. Designs for such museums are necessarily complex. Outside specialists must be enlisted in the design phase. A basic plan outlines facilities, areas relationships of functions, and space allocations. A consultant architect can establish footage requirements and costs. Outside consultants should present three alternative plans and budget breakdown for presentation to the administrative body. A qualified designer is then chosen. Basic design mistakes include: emphasis on outside rather than inside space, no provision for future expansion. Design specialists provide essential innovations in the areas of three dimensional communication e.g. explanatory exhibits and quality of overall interior space layouts. Careful use of structure, space, form, color, motion, sound and lighting can enrich the museum experience for visitors.