Verulamium, now known as St Albans, was the third largest city of Roman Britain. Here are some of the most incredible Roman ruins in the UK, all in the shadow of St Albans Cathedral, the oldest site of continuous Christian worship in Britain. There’s so much history here: a Norman tower, the longest nave in England, medieval wall paintings, the Shrines of Alban and Amphibalus, and the Abbot’s Kitchen (a café). All just 30 mins on the train from London.