Here is a 3D map and 3D views of the cavern, in Sofia, that you can use in the Horror on the Orient Express campaign for Call of Cthulhu, published by Chaosium.
(REMINDER : THIS IS NOT AN OFFICIAL DESIGN, BUT ONLY FAN ART CREATED BY DRAKEN RPG)
(Click on the picture to open the full size version in a new tab, then right-click and save!)
