There were lots more Roman arches in Ancona, but I also spotted this slightly differently shaped one in a piece of very old wall. A quick Google has told me that this is probably either a lancet arch or an equilateral arch, and I'm going to find out which later by measuring it!
Photo challenge (6) - Triangular bridge
Thursday took us to Dubrovnik, where we played "spot the Game of Thrones filming locations" and tried to avoid melting in the heat. On the way out of the port, I spotted the Franjo Tudman bridge, which is pure geometry in action.
Photo challenge (5) - Tiling patterns
Another day aboard with nowhere to go, hence this slightly tenuous floor tiling pattern - I thought it was quite pretty though!
Today we visited an active volcano near Santorini, which was all very interesting, but had limited opportunities for taking mathematical photos. The best I could find today were some Greek letters on a can of beer and some pretty reflections in the water when we arrived on Mykonos in the evening.
Monday was a day at sea, with not much to do except lounge around in the sun. We retreated to one of the bars in the afternoon when it got too hot, and decided to attempt to play Set with playing cards.
Photo challenge (2) - Archways
Walking around Split in Croatia gave me lots of opportunities to spot semi-circular or Roman arches - I may turn these into a couple of short problems for starters. There's a good one on NRich already!
As we spent the day driving to Manchester, then flying to Munich and finally on to Venice, then getting a coach to the port, then doing our lifeboat safety drill, I had very little time to spot any maths. However, I decided that the infinite mirrored lifts onboard our boat were definitely mathematical enough to become my first photo in the challenge!