Caernarfon Castle is a massive fortress and medieval filming location located in Caernarfon, North Wales. Built by Edward I in the late 13th century as part of his campaign to control Wales, it remains one of the best-preserved and most impressive examples of medieval military architecture in the UK today.
The castle was both the filming location for Prince Charles's investiture as the Prince of Wales in season 3 of The Crownas well as the actual site where the ceremony took place in 1969.