Perched atop a steep limestone crag high above the River Cennen is Wales' ultimate romantic ruined castle, visible for miles in every direction. The current structure was built at the end of the 13th century in the course of Edward I's conquest of Wales. It was partially dismantled in 1462 during the Wars of the Roses. The most unusual feature is a stone-vaulted passage running along the top of the sheer southern cliff, which leads down to a long, narrow, natural cave; bring a torch or hire one from the ticket office (£1.50).
Carreg Cennen is signposted from the A483, heading south from Llandeilo.
