looking for an image

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Dear All,

Maybe you can help me concerning an illustration i once had. I know it's out there and I believe it is an illustration from a D&D book. But unfortunately there are a lot of books out there and I can't seem to recall the correct one...

The images is as follows:  

It is a picture with some sort op open door/entrance on one side. From this entrance you reach a natural cavern with a few pillars in the front. In the cavern there is a paved road with a man-made arch, a few bridges that cross water. The road leads I believe to another closed door.

Anyone any idea where I have seen this picture?