You will need to use a 3rd party software in order to create a city environment Here are the options we like the most: TerraForm is a great tool for users who are more experienced with Digital Elevation Models (DEMs).  It is the most flexible way but it is more labor intensive. Fortunately, TerraForm is providing an excellent Tutorial which goes through the whole pipeline. Cesium for Unreal is new plugin which generates an environment based on real-world 3D data within minutes. This tutorial by Mohamed Sallam is demonstrating two different methods to create a city environment for Twinmotion. The same workflows can be used for Unreal Engine 4.