Vault of the Royal Abbey of Chaalis (Ermenonville, Oise, France).
The abbey was mainly destructed after by the french revolution. The Chaalis abbey site hosts wonderful gardens, the Jacquemart-André museum and the ruins of the abbey. That's a nice journey, possible all along the year, just near Senlis and Ermenonville (country of Jean Jacques Rousseau) and at +- 45mn of Paris by car.
For additional informations : www.chaalis.fr
* I just resubmitted a resized photo to post it in "panorama" section
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