On the rooftop of the Lingotto Fiere, this intimate gallery houses the personal collection of late Fiat head Gianni Agnelli, with masterpieces by Canaletto, Renoir, Manet, Matisse and Picasso, among others. Apart from the paintings, your ticket grants you access to the Lingotto's famous rooftop test track.
It also has an attached (and free) bookshop, full of wonderful art and design titles. It's around 3km south of the centre and accessible by both metro and bus.