I came across the maps of Scott Reinhard on Twitter and I fell down the rabbit hole of the art of combining old maps with modern 3D elevation data. This is what I was able to create playing around with QGis, Blender 3D and Photoshop:
Inspired by the work of Scott Reinhard.
Elevation data from Copernicus Land Monitoring Service.
Made with QGis, Blender3D and Photoshop.