START AT THIS MARKET

ON TUESDAY, FRIDAY OR SUNDAY MORNINGS AT THE CORVISART MÉTRO STOP

Adapted from a Google map

The street behind the flower stand is filled with pictures:

 Rue des Cinq Diamants

The enclave has no bank or post office, just a grocery at the crossroads:

At the grocery turn right (on "Main Street," rue de la Butte-aux Cailles) to come to a crossroad ("place de la Commune"):

More here.

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Next,

Come to a "castle"