Krakow, located in the south of Poland, is the second largest city in the country and also one of the oldest. Its central position in Europe makes it a perfect stop on an Interrail trip, due to its proximity to other popular cities like Berlin, Prague, Vienna or Budapest. Although Poland is in the EU, they don’t use the euro but the złoty, so you’ll have to exchange some currency. The conversion rate is roughly 1 Euro = 4.3 Złoty.