A huge, hulking presence in downtown Casablanca, it's more like a 'block' than a building. The architect, Paul Tournon, carries on his lifelong love affair with reinforced concrete here to inspiring effect. It's free to enter (when it's open), but you have to part with a few dirhams to see upstairs.
The ground floor is amazing enough, though. If you'd ever wondered what a cathedral looked like with all the ornamentation taken out, this is the place for you. In a city short on sights (discounting Hassan II Mosque), it's well worth a detour.
Google map: bit.ly/b1DPeu