 The Rynek Underground museum, under the main square, is an evocative modern display of Kraków's 1000+ years of history though its streets, activities and artifacts.This followed the massively extended excavations which started in a small way in 2005 and, as more and more was found, ran on eventually to 2010.A half-an-hour tram-ride takes you to the little-heralded Polish Aviation Museum considered eighth world's best aviation museum by CNN and featuring over 200 aircraft including a Sopwith Camel among other First World War biplanes; a comprehensive display of aero engines; and essentially a complete collection of airplane types developed by Poland after 1945.