The Medieval urban layout of the Old Town has not changed for centuries. Every visitor to Cracow should see Europe’s largest Medieval market square with its Cloth Hall, the Church of the Holy Mary with its Gothic pentaptych altarpiece carved from limewood, Wawel Hill and its royal castle and the Wawel cathedral with its outstanding Renaissance chapel, the Medieval university building of Collegium Maius with its unique collection of astronomical instruments, the Barbican, and St Florian’s Gate.