When Britain was run by the Romans, only three cities were bigger than this one. At first it was a place behind whose fortifications the Roman legions could muster. Gradually it evolved and became a city for ordinary civilians as well as military types. Here the Old Work stands, the biggest stretch of any free-standing wall built by Romans to be seen in the British Isles. The Old Work is a kind of basilica edifice and stands more than 20 feet high. There is also a Roman Town House nearby. A tour is available with an available commentary on earphones; most informative about the daily lives of people who inhabited this place through the ages.