Opolski szlak cysterski - ziemia nyska
https://nysa.eu/pl/aktualnosci/szkolenie-z-zakresu-ochrony-ludnosci-i-obrony-cywilnej.html
Each object on the "Learn the history" route is marked with a special plate with a QR code indicating the use of this technology. In addition, we have a camera in each of the smartphones. ...