Mont Saint-Michel and its bay s a world (UNESCO) national heritage site off the coast of France. The castle was originally a monastery but was converted to a prison during the French Revolution. Its unique position on and island that is connected to the mainland by a one-kilometer long road make it one of the most recognizable sights in France outside the city of Paris.
You can visit the great Second Life reconstruction of Mont San-Michel here. I attended a wedding here once, so the venue should be available for rentals:
|The real Mont San-Michel|