Visit Unique Sites During Les Journées du Patrimone Weekend

The weekend of September 19 and 20 will be the dates of the annual European Days of Patrimony.
This extraordinary weekend (celebrated all over France and in other European Countries) is a time of free museum admissions and even better--- opening of historic sites or public buildings not generally open to the public.  There are hundreds of sites to choose from.  Here are three that might be of special interest:

In the 5th and 6th arrondissements:  The Palais du Luxembourg (home to the French Senate and once a palace of a Medeci) and the Sorbonne.  Beautiful historic buildings...

In the 14th éme the Reservoir de Montsouris, a subterranean warren of tunnels, arches and water courses is open.  And only open on this special weekend.  Just adjacent to the lovely Parc Montsouris, this underground reservoir truly gives you the best 'off the beaten path' bragging rights.  Plus is is beautiful.

Google the Journées du Patrimoine website for a full list of all the special openings and free admissions.  This is a very popular event so do expect some long lines.