If you’re after an appealing detour, point your car in the direction of Cardiff. It features popular attractions like Principality Stadium and Cardiff Castle. To get there, travel 25 miles from Llantilio Pertholey. Get set to start clocking up those miles, because Swansea Beach and Oystermouth Castle are also worth a road trip. You’ll find these well-known sights in Swansea, 45 miles away.