We spent a little while on Rhodes (currently part of Greece, though fought over by the Knights Hospitallers, Ottomans, Byzantines, Italians and a number of others over the years) a few weeks ago and ran across a few cannon and things that might be interesting to people here.
First of all, the Old City is littered with stone cannon balls. They use them for edging, traffic barricades and ornaments all over the place. A few they even stack up officially.
I didn't run across a mortar for them, but a nice bronze one is in the museum in Paris.