The Archaeological Site of Mystras was added to the World Heritage List in 1989 and it was added to my collection last week thanks to Elena. Its the 819th site in my UNESCO collection.
Mystras, the 'Wonder of the Morea', was built as an amphitheatre around the fortress erected in 1249 by William of Villehardouin. Reconquered by the Byzantines, then occupied by the Turks and the Venetians, the city was abandoned in 1832, leaving only the breathtaking medieval ruins, standing in a beautiful landscape. The complex of the ruins of Mystras offers the image of a city with a brilliant destiny that was deserted by men and threatened by the return of encroaching vegetation, which is splitting the walls and covering the slopes, thus destroying here and there fragile traces of history. - in: http://whc.unesco.org/en/list/511