A very big shop dedicated to aviation. Anything about aircraft can be found there. They sell books (lots of them), magazines, watches, apparel, professional pilot supplies (headsets, flight bags), computer flight simulations, aviation art, etc. They also schedule aviation-related activities, including flying almost-professional flight simulators on site. There's even a real DC-3 cockpit on the ceiling!
You definitely MUST visit la Aeroteca if you are interested in aviation.
They also have a quit big plastic model section, with only aviation-related kits.