The Château des Sarrasins is a 'castle' in the figurative sense, not a lordly building, but a protruding from the eastern flank of the Grand Colombiers rock formation - so the name is already true. The last about 200 meters to the "Château" are not passable by bike, because you have to climb a bit and from now on should have both hands free :-). The view rewards the Kraxelei but in any case. From a small plateau you have a fantastic view of the Rhone Valley and Lac de Bourget (the largest natural lake located entirely within France) to the south.