Chepstow Castle
Chepstow Castle has three baileys, the lowest being added in the 13th century CE, and reaches a length of 213 meters (700 ft) which presents an imposing arrangement of crenelated walls with round and square towers. The castle's multiple building phases are clearly indicated by the different colours of the stonework: grey limestone and red or yellow sandstone. The walls are around 12 metres (40 ft) high and, on the safer cliff edge, are just 0.91 metres (3 ft) thick while those elsewhere are 2.97 metres (9.75 ft) thick.