Nice site you got there!
Plans for a castle near Almere (the Netherlands) never came further than this:
They started building in 2002, but it was left unfinished since 2002, I believe due to financial problems. Nowaydays the ruin a touristic attraction
Funny thing is the castle's site (province of Flevoland) was only reclaimed from the IJsselmeer lake in 1968. In the medieval period most parts of what is now land was sea. So there was never a castle near this spot.