Here is the M Pavillon seen from a distance. It’s built only for the Marseille 2013 European Culture Capital year, and will be dismantled later on. It houses an exhibition space (on Marseille and its regions) and an info center.
The pavilion is located in the old port, next to the Hôtel de ville, and it’s open every day 11am-8pm (entrace is free of charge). Recommended!