Facts about Caernarfon Castle

Construction began in 1283, making the castle around 740 years old. Building work continued for roughly 47 years, effectively ending around 1330, though parts were never completed.

It was built for King Edward I of England, with construction directed by his master mason, James of St George, following Edward's conquest of Wales in 1282–83.

To secure Edward I's conquest of north Wales as part of an 'Iron Ring' of fortresses (with Conwy, Harlech and Beaumaris), and to serve as the administrative and ceremonial capital of the new English-controlled territory.

About 47 years, from 1283 to around 1330, though the castle's interior buildings were never fully finished.

The walls enclose approximately 4.2 acres (1.7 hectares), with a perimeter of around 734 metres (2,408 ft).

Gwynedd, in north-west Wales. The town's postcode is LL55 2AY.

It's a genuine medieval castle, substantially intact from the outside, though its interior buildings were never fully completed and some later restoration work has taken place, particularly from the Victorian era onward.