On a rainy afternoon in Tunis, one of the best things to do is to visit the Bardo Museum. Located in the capital city, the museum is home to one of the world's most impressive collections of Roman mosaics. You can spend hours exploring the various exhibits and admiring the intricate artwork. The museum also offers a glimpse into Tunisia's rich history, with artifacts dating back to ancient times. It's a perfect way to spend a rainy afternoon, immersing yourself in art and history.