The Bardo museum has the most impressive collection of mosaics that I've ever seen. They range from Roman to early Christian to Islamic, and I highly recommend making a visit. The entrance fee was 11TND and a photo pass was an additional 1TND. However, not all of the rooms are open due to the renovation. The ones that are blocked off are not systematic, nor are they properly labeled, so be sure to walk around a bit (and try different staircases) to find the rooms that are. You won't be disappointed! Taking the metro was also easy, but be prepared for a little bit of a walk and crossing two streets with no crosswalks.
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