There are the passages in Paris, arcaded walkways between buildings or blocks that house a host of businesses. There are also the weird little spaces that are shortcuts to places only the locals know.
One of the beauties of being really curious and a foreigner is that if I see an open door to a cool-looking place, I’ll walk right through it and see where it leads. Sometimes I startle people and have to play the “silly me, I’m so lost” card, but usually, these places are totally devoid of people and are really glorious.
Here’s a series of outdoor hallways I found off the Rue de Belleville one day, near the Jourdain métro stop. Leave it to the French to have grapes growing like weeds in the middle of the city!