#1: Preserved Artillery Pieces in Greek Military Museums. Author: Costas_TT, Posted: Fri Aug 16, 2013 11:36 am ---- All photos from the www.army.gr site
Also, if you google the Greek words for "Military Museum", you get these results. Bear in mind that not all are from Greece, or indeed relevant, but you can blame Google.
#3: Re: Preserved Artillery Pieces in Greek Military Museums. Author: Costas_TT, Posted: Tue Aug 20, 2013 11:49 pm ---- Preserved artillery pieces in front of the Hellenic Military Academy Headquarters building: www.sse.gr/page_gr.php?id=66