Castell Caernarfon

Location: Castle Street, Caerphilly CF83 1JD

Telephone: 03000 252239

Email: cadw@gov.wales

Website: www.cadw.gov.wales

The fortress sprawls over a huge area making it the largest castle in Wales. It’s also a great backdrop for TV and film. It secured a starring role in the popular BBC TV series Merlin.

This huge stone castle, surrounded by a series of moats and watery islands was the brainchild of Gilbert ‘the Red’ de Clare, a redheaded nobleman of Norman descent. He also built the original Castell Coch, ‘Red Castle’, located the other side of Caerphilly mountain.

Image © Crown copyright (2025) Cadw

Offer for YAC Pass holders:
Free entry with a YAC Pass Card when accompanied by a paying adult