Bardo National Museum

They are still expanding and renovating some of the facilities. It's a huge, spacious place, with high ceilings, perfect for enjoying the stunning mosaics which are displayed there. They are located both on the walls and on the floor, therefore you have to wear a protective cloth on your feet. It is one of the biggest and best preserved collections of Roman mosaics in the world. The museum is a little out of town but it is still a must if you pass through Tunisia.