We took a Bag Baku tour (find them on Facebook) to Gobustan. This place is unique due to the hundreds of petroglyphs on the rocks. It's rock art at it's finest. You'll need a couple of hours to visit the site. Start with the museum and then head to the site and walk around the stones discovering the lives of our great-great-great ancestors. The views towards the Caspian Sea ar quite specatcular from up there. We really enjoyed it!