Mobile services support various situations in everyday life and with the spread of mobile internet and better equipped mobile devices mobile services are becoming increasingly important, especially in tourism. Mobile tagging, based on QR codes or similar approaches, offers a technique to increase the accessibility of mobile services. In this paper potential applications of QR Codes in tourism, and specifically within a cultural institution (the Mercedes-Benz Museum), are identified and prototypically implemented. In a second step, these application scenarios are evaluated within a test user study. Results show that both, usability and intention to use the services are potentially high and QR codes are able to provide additional comfort in accessing mobile content and services.