For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download MegaTextures Pack – PBR for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
MegaTextures Pack – PBR v1.0
“If possible, please buy the package to support the developer”
MegaTextures Pack contains 180+ of high-quality PBR-ready textures.
All textures provided are in 2048×2048 resolution. All of the textures are seamless and tileable. Due to a large library size, all of the textures are supplied in a high-quality compressed JPEG format.
All of the textures contain the following maps: Albedo, Ambient Occlusion, Glossiness, Metalness, Roughness, Specularity, and Normal.
An immense amount of work has gone into the creation of this library; however please note that this library is still a work-in-progress, therefore we ask you to let us know if you find some inconsistencies.
The textures were procedurally generated using various software/techniques. We were given the rights to redistribute the procedural textures.
Amount of textures in different categories:
Wood: 26
Animal: 22
Stone: 18
Nature: 30
Metals: 33
Architecture: 51