Margie
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Visited at 2pm on a Thursday in mid October. Entry 4.50 euro. About 2 people there! You'll need to walk up the 124 step narrow stone spiral staircase with views out the narrow slit windows as you go. There are 3 levels - first level up there is a large room with several audiovisual booths - you can sit on a stone seat to listen in French or English. It was quite peaceful and cool there, hearing about history and construction. And one could look out the windows too.
Level 2 was another large room with what looked like some stone walls with original painted designs. I didn't spend long here. Up further to the roof, one passes through an old hinged wooden door (keep it closed to stop pigeons coming in!). The top has parapets and another round tower which is inaccessible. The views are 360° - beautiful! Of the rooftops of Villeneuve-les-Avignon, the Rhône river, Palais des Papes and Pont d'Avignon. Being mid-afternoon the light was gorgeous - reflecting off the dark grey clouds and silvery Rhône of the west. You can observe life happening below on and off the river. I think the ambience of the place was heightened by being there totally alone - and thinking of what had taken place in this area over the centuries. Well worth the climb and entry fee!!