Mountaintop Desert Castle

Some kind of castle, perched on the peak of a mountain. I think I found the concept sketch for this castle on Deviant Art ages ago. I have been unable to locate either it, or the original artist. There was just one angle, and no reference for the back, so I just made up some gardens and stuff to go underneath. There is no interior, though it would be fun to make one. Like this model, but need something a bit different? I take commissions! http://peripheralarbor.com/commission/ Actual license is "Public Domain" see details here https://ip.tryop.com/