From Stamps of the World
Delft is a city and a municipality in the European country Netherlands. There it forms part of the province of South Holland (Zuid-Holland), where it is located to the north of bigger city Rotterdam and to the south of provincial capital The Hague. Delft is primarily known for its historic town centre with canals, for Delft Blue pottery (Delftware), for the Delft University of Technology, for the painter Vermeer and the scientist Antony van Leeuwenhoek, and for its association with the Dutch royal family, the House of Orange-Nassau. The "Nieuwe Kerk" (New Church), constructed between 1381 and 1496, contains the Dutch royal family's burial vault, which between funerals is sealed with a 5,000 kg (11,023 lb) cover stone.
Read more @ http://en.wikipedia.org/wiki/Delft