Rhodes. Greece. Close-up view a decorative red and white arched window on the façade of the pink Mosque of Suleiman (Suleyman) the Magnificent situated in the old town. Dating from 1522 the Mosque was built to honour the Sultans victory over the knights and has been partially rebuilt over the years. The old town is a UNESCO world heritage listed site and the best preserved, oldest and largest living medieval city in Europe. The 4km defensive walls were built by the Knights of St John during the 13th to 15th century to defend Western Europe against the expanding Ottoman Empire. Within the walls are a medieval warren of small alleyways and magnificent historical buildings. The island of Rhodes is the largest of the Dodecanese Island group and one of the most popular Greek Islands.