I always have a blast watching cities integrating QR Codes into their infrastructure. In Lisbon, Portugal QR Codes have been integrated into the basalt and limestone streets. You can watch in the video below on how they created this QR Code. When a tourist passes by one of these QR Codes embedded into the street they can scan the code to receive tourist information in English and Portuguese. I love these types of QR Code execution because in comparison of having printed tourist information QR Cods allow tourist to bypass language barriers and receive the content in their native language. For additional examples of cities all around the world using QR Codes for in a variety of different ways click here.