Castles were built to keep people out, but Cardiff Castles defences are not good enough for NATO heads of state when they have their working dinner this evening. USA President Barack Obama and UK Prime Minister David Cameron are amongst world leaders protected by a ring of steel fencing. Cardiff Castle’s £15 million conservation and development project have equipped the most prestigious venue in Wales to host such an international event. Take a look at the download to see the inside of the Cardiff Castle and find out about its conservation and development which involved key members of the Edwards hart team.