There are 195 megaliths in Kerzerho, aligned east to west. They extend over 200 metres in 5 rows. Dating from between 5,000 to 2,000 BC, they have of course suffered over the years. In fact only a few centuries ago there were 1130 stones in 11 rows: the structure must have been 2 kilometres long by 65 metres wide.References:
Built around AD 90 to entertain the legionaries stationed at the fort of Caerleon (Isca), the impressive amphitheatre was the Roman equivalent of today’s multiplex cinema. Wooden benches provided seating for up to 6,000 spectators, who would gather to watch bloodthirsty displays featuring gladiatorial combat and exotic wild animals.
Long after the Romans left, the amphitheatre took on a new life in Arthurian legend. Geoffrey of Monmouth, the somewhat imaginative 12th-century scholar, wrote in his History of the Kings of Britain that Arthur was crowned in Caerleon and that the ruined amphitheatre was actually the remains of King Arthur’s Round Table.
Today it is the most complete Roman amphitheatre in Britain.