Interactive experiences, whether on the screen or in VR/AR, are the next big step in 3D GIS. In this session, you will get an introductory guide to Unity and Unreal, the leading game engines. You will learn to build 3D experiences that allow you to walk through realistically rendered city models or to explore interactive storytelling of your 3D project. We will also demonstrate how to import, create and prepare 3D data in CityEngine and export it efficiently into the game engines. We will conclude with a discussion on the role of game engines in the future of GIS.