Ruined Criccieth Castle perches up on the clifftop and offers views stretching along the southern coast and across Tremadog Bay to Harlech. Constructed by Welsh prince Llywelyn the Great in 1239, it was overrun in 1283 by Edward I’s forces and recaptured for the Welsh in 1404 by Owain Glyndŵr, whose forces promptly sacked it. Today there is a small but informative exhibition centre at the ticket office.