Dolly, Dumbarton and a ?

Left work a wee bit early to drop off a prescription at another hospital and it was such a nice day I thought I should stop and blip! I decided to blip Dumbarton rock, a familiar sight as I pass it every day going to and from work! I've never been up to it, I really should! If you look closely you can see a question mark, the last George Wyllie question mark, at least that I've captured! A Dumbarton related question I once asked a colleague was "What exactly is a Denny tank anyway?", stars if you know but only if you're not from Dumbarton!