The Chateau de Miranda - also known as Chateau de Noisy or Home de Noisy - located not far from Dinant in Belgium, is abandoned since 1991.
During the French revolution, the family of the Count from Liedekerke-Beaufort has left the nearby feudal castle of Vèves to hide in a farm outside the village. After the revolution, the farm took the name of castle and finally became this gigantic house.
Between World War I and II, the castle became the "Home de Noisy", a vacation camp for SNCB (Belgian national rail company) railwaymen's childrens.
It was finally abandoned in 1991 and is slowly falling in ruins since. It has now became a very dangerous place to explore as you can guess by looking at the photos.
http://www.flickr.com/photos/polanri/sets/72057594049256550/
http://www.pastglory.nl/urban-exploration/chateau_noisy/chateau_noisy_miranda.html
http://telefunker.wordpress.com/2008/06/14/chateau-miranda-belgium/