Tony: This wall's pretty good isn't it? And it's all pure rock solid Roman, and if you think that's good, you should see what's inside it. Because this is Caerwent, the best preserved Roman town in Britain. And it's a cracker, here's the plan. Look, you've got temple, forum, baths, houses, shops, but there's still pieces missing here, here, here, here, absolutely nothing. That's because those areas have never been touched, never been dug until now. We've been invited here to get to the very heart of the Roman town, uncover its secrets and fill in the blanks.