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. After pointing the lens of this camera at the QR code, the phone will automatically recognize the code. Warning! Sometimes you need an easy-to-download application that reads QR codes. This application is also part of e.g. facebook on the phone. After aiming the camera lens at the code, the smartphone will start playing the recorded speech of the monument. It is a form of a mini-audition from which we learn interesting details about the history of the monument; the character it depicts, be it the history of a place, city or historical event.