This card from Banská Štiavnica in Slovakia is my 780 UNESCO site. I've got it thanks to Mircea.
Banská Štiavnica is a town in central Slovakia. It is a completely preserved medieval town. Because of their historical value, the town and its surroundings were proclaimed by the UNESCO to be a World Heritage Site on December 11, 1993. - in: wikipedia
Foto: Andrej Ebert
Over the centuries, the town of Banská Štiavnica was visited by many outstanding engineers and scientists who contributed to its fame. The old medieval mining centre grew into a town with Renaissance palaces, 16th-century churches, elegant squares and castles. The urban centre blends into the surrounding landscape, which contains vital relics of the mining and metallurgical activities of the past. - in: http://whc.unesco.org/en/list/618