Extra “passport” photos

There are photo booths in seemingly every train station in Europe, so you can buy a set of photos when you get there, or just bring an extra set with you, as they weigh nothing and may be needed for city travel passes and such. You may also need some to give to that lovely European you meet during your travels. Sadly, I still have all four of mine. Regular photo booth pictures are fine; don’t pay those death-dealing passport photo places for more pictures than you have to.