Let’s go to Île-de-France, northwest of Paris, to Pontoise, in this original work by Lotza. Pontoise, whose name means “A bridge over the Oise”, is home to about 900 underground passages. The historic center of Pontoise is built on a plateau, called Mont Bélien, which can be seen in this poster. Very early on, the inhabitants extracted the limestone from this plateau to build the city; as a result, most of the houses in the city center have a cellar.
You will find below a situation to better see the postcard.
The postcard is sent in a bubble envelope.