Hop back on a local train to Krakow. Possibly the best known of all Poland's cities, Krakow was the residence of Polish kings from the 11th to the 17th centuries, and its Old Town is a UNESCO World Heritage-listed site. Join your local leader on an orientation walk around the city, then maybe head to one of the biggest medieval squares in Central Europe. You could also visit Wawel Royal Castle, which sits on a hill next to the Vistula River, or check out the 13th-century town square of Rynek Glowny and get a glimpse inside St Mary's Basilica. This city is also home to the second oldest university in Central Europe – Jagiellonian University, which boasts Copernicus and Pope John Paul II among its alumni. Tonight is again all yours to do as you please – maybe make your way to the Jewish Quarter for laidback vibes and good food.