Yep...you read that right...its a stone well. Nothing special. Just thought I'd try making something a little more naturalistic in ZBrush. Modeled entirely in ZBrush, but rendered out in Maya using Mental Ray. Took a few pointers from Tate Mosesian's video series on Pixologic's site, http://pixologic.com/zclassroom/homeroom/lesson/environments-with-tate-mosesian/. Tate Mosesian is the Lead Environment Artist at Naughty Dog so he's got some chops. Anyway hope you enjoy.
All the best