Mandelbulb3D
There's some time now that i'm looking how to build something that could be the famous mines of Moria, not exactly what i had in mind, not enough squary imo, but the render isn't that bad
There's some time now that i'm looking how to build something that could be the famous mines of Moria, not exactly what i had in mind, not enough squary imo, but the render isn't that bad

:origin()/pre00/e1e9/th/pre/f/2012/033/f/0/hall_of_mirrors_by_kr0mat1k-d4of6mg.jpg)
spec : 1 / depht : 2 combined with fog and depht color give a nice result
And i'm also surprised by your reflection values, i guess i should give it a try
I guess you could simply add it in PS or GIMP... and call it a manipulation...