The ampitheater of El Jem was great, but we ended up stranded in the town (which is not so great) because our coach driver neglected to tell us that another bus wouldn't stop unless...well, unless he felt like it. Anyways, the ampitheater was amazing. You can explore it to your hearts content, unlike the one in Rome. The most impressive part was going down underneath where many pisoners would have spent their last few lonely moments.