Digital twins are a part of the digitalization development to improve efficiency in various industries. They are 3D replicas of real world systems and visualize the the data of the physical environment in real time. It is also possible to do simulations and control the physical copy by interacting with the digital twin. We create digital twins by modelling existing environments and adding 3D content to them. We use technologies such as photogrammetry, laser scanning and game engines. You may try one digital twin here: https://foto.aalto.fi/seikkailu/