Heres a great example,
https://forums.cgsociety.org/showthre...hreadid=451732
Notice that the textures, bumps, displacments do most of the work, the modeling gives undulations that would have been very hard to do, but the cracks in the floor etc are all textures, and you've got to agree that it looks very realistic, without modeling everything.
"No pressure, no diamonds" Thomas Carlyle