Despite a turbulent history during which it has been occupied and conquered by a succession of its neighbours and European colonial powers, Dubrovnik is now a town at peace, allowing visitors to make the most of its rich vegetation, beautiful lakes, white pebble beaches and crystal-clear sea. Political upheaval has seldom kept tourists away from this uniquely lovely Adriatic port city; for centuries it has drawn those seeking fine accommodations, excellent cuisine, beautiful surroundings and recreational opportunities. George Bernard Shaw is quoted as describing Dubrovnik as 'heaven on earth'. The old town, dating from the 7th century, is on UNESCO's list of World Heritage Sites. Enclosed by city walls built in the 12th century, the buildings of the town represent a cross-section of medieval architectural styles and remain well preserved. The centre of the town is the Stradun, its main street, which was originally a channel separating an island from the mainland, and was filled in to join two opposite towns into the merged city of Dubrovnik. The main tourist area lies southeast of the old town at Ploce, where most hotels and the best beaches can be found. There are numerous churches, monasteries and museums to explore and the coastal belt is awash with marinas, piers and promenades.