With the availability of technology, heritage sites, such as museums, have been increasing developing smart phone applications as a tool to provide more enjoyable and educational experiences for visitors. The Suwon Hwaseong museum, located at the UNESCO world heritage site, recently introduced the U-SEUM service ? an Android smart-phone application which functions with a Location Based System (LBS). To assess its impact, a total of 221 valid reponses were collected to measure visitor experiences to identify the relationships amongst visitation variables including on-site experience, satisfaction and changed attitudes toward the U-SEUM. Five dimensions of the U-SEUM experience were extracted by through exploratory factor analysis. Path analysis with AMOS package showed that fun and education were significant antecedents to satisfaction of the U-SEUM while fun and novelty as well as satisfaction were significant antecedents to changed attitudes toward the U-SEUM. Togetherness was not significant to either satisfaction or changed attitude while fun was significant to both satisfaction and changed attitude toward U-SEUM. The experiential dimensions of the U-SEUM need to refined and confirmed by further research, involving the applicability of smart phone applications in heritage tourism.