Travelers are voting Cardiff Castle, Caerphilly Castle and Morlais Castle as the best of 3 castles in Cardiff. There is 3 castles in Aberporth a city just 152 km from Cardiff. The most popular of these is Picton Castle in Aberporth. You can find 104 Castle in the country of United Kingdom and Tower of London is our members favorite Castle in all of United Kingdom. Want more? Check out our map of castles in Cardiff.