Divci Kamen wasn't mentioned in my guidebook, probably because it was difficult to get to except by bike or on foot, and I thought it was one of the best discoveries of my trip: a place where just about the only English in view was the sign reading, "Enter at your own risk." I've got a few more pictures in the main gallery, but they don't convey the fun of rambling around the ruins.
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When I arrived, the little table at the gate was all set up, with brocures and what-not, but there was no one in sight. The site was obviously still open- and then I noticed the other bit of English: "Donation." So I took a guess at what the entrance fee might be, dropped it in the box, and headed inside.