Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Medieval Castle Free.
Medieval Castle
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This is a single castle model. You can’t change geometry in Unity but objects can be removed, replaced, and moved into another place. You can change all in 3D MAX, Maya, Blender… So this pack can be used as Medieval Envelopment construction KIT, where all objects can be used within another levels and locations in your game. Asset can be used with Free and Pro Unity versions as well. All buildings have an interior. This pack contains 36 large models and over 65 small objects. Large objects have about 290K polygons. Level primarily designed for PC or consuls first or third person type games.
TEXTURES Textures are in .PNG file format 512×512 – 2048×2048 Diffuse, Normals, AO
Without LODS.