Cardigan Castle (Castell Aberteifi) is an eleventh-century stronghold, which typically hosts a summer outdoor theatre season in association with Theatr Mwldan.
Castlewellan Castle is a nineteenth-century house surrounded by extensive grounds; now a Christian conference centre, the site has also hosted open-air theatre performances by Kabosh.
Chepstow Castle is an ancient and beautifully preserved Norman-era stronghold, which hosts a regular open-air theatre season with productions by various touring companies.
Chichester Cathedral is a historic building that is over nine hundred years old, with open-air theatre performances occasionally taking place in the grounds.
Chilham Castle is a manor house and keep that has hosted various outdoor theatre productions in the estate grounds as part of its seasonal events programme.