Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Ancient Environment Free.
This modular package is designed to create ancient worlds.
– 140 prefabs of ruins + LOD stages
– 51 elementary prefabs
– 36 fully editable species of trees, bushes, plants
– 11 new cliffs and rocks
– 15 hi-res ground textures + normalmaps
– 3 demo scenes
Overlay shader and microdetail textures, grass textures and particles.