Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Top-Down Graveyard Free.
Top-Down Graveyard v1.1
This pack offers a wide range of assets to construct a Top-Down Graveyard level for your game.
With over 150 Prefabs: graves, walls, old trees etc. and high-res ground textures you can create AAA quality Top Down level.
With all the assets easy to you and put together in your scene. Demo scene included.
Assets works on mobile.