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Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download The Big Castle Kit Free.
The Big Castle Kit v1.6
The Big Castle Kit is a beautifully crafted environment kit for first person games. It contains everything you need for a complete fantasy level. With numerous meshes and decals, there is an almost infinite number of possible combinations at your disposal. If you want your game to look AAA, then this is the kit for you.
Download Demo (850MB)
Features:
PBR metal/smoothness workflow
Separate interior for better culling
Snow shader
HQ normal maps – either generated procedurally or from hi-res meshes
All buildings have an interior
Sunset scene
Winter scene
Candle room scene