"Les Frigos" are the old refrigerated warehouses at the rail freight station in the 13th arondissement. They're currently occupied by artists and squatters, but there is some uncertainty about their future now that the city of Paris owns the building. For more information (in French), visit http://www.les-frigos.com/.
I'll be posting a couple more pictures of the Frigos in my inbox in a day or two (or three, or four...).