Two summits make up the Grand Colombier. To the North, one of the summits has a cross whilst the Southern summit has a triangulation point. From the top of these two settings, hikers may admire the magnificent panorama over the Jura, the Rhone Valley..

Following the example of Grand Colombier, the Fenestrez Observatory offers beautiful panoramas from 900 m high. Those visitors who venture out to this spot may admire the Lakes of Bourget and Annecy and slightly further away, the Alps.