Created from open LiDAR data https://geoportaal.maaamet.ee/ . Elevation data: Estonian Land Board 2012-2017 
3D videos at https://www.youtube.com/playlist?list=PLeZH6zvJosTkd9MCxGZyFGD70JWLRwZdu
3D models at https://sketchfab.com/gatons/collections/igaunijas-pilskalni-estonian-hillforts