If you’re up for a little more adventure, keep on driving to Cardiff, 25 miles from Abergavenny. You’ll find plenty more wonderful things to see and do here, such as Principality Stadium and Cardiff Castle. Swansea, 45 miles away, is another road-trip destination that’s worth the trek. Take a look around Swansea Beach and Oystermouth Castle, two must-see sights in the area.