The city has long been known as a centre of education, particularly in the fields of medicine, Scots law, the sciences and engineering. The University of Edinburgh, founded in 1583 and now one of four in the city, was placed 17th in the QS World University Rankings in 2013 and 2014. The city is also famous for the Edinburgh International Festival and the Fringe, the latter being the largest annual international arts festival in the world. The city's historical and cultural attractions have made it the second most popular tourist destination in the United Kingdom after London, attracting over one million overseas visitors each year. Historic sites in Edinburgh include Edinburgh Castle, Holyrood Palace, the churches of St. Giles, Greyfriars and the Canongate, and the extensive Georgian New Town, built in the 18th century. Edinburgh's Old Town and New Town together are listed as a UNESCO World Heritage Site, which has been managed by Edinburgh World Heritage since 1999.