Castell Coch (English: Red Castle) is a 19th-century Gothic Revival castle built on the remains of a genuine 13th-century fortification. It is situated on a steep hillside high above the village of Tongwynlais, to the north of Cardiff in Wales, and is a Grade I listed building as of 28 January 1963.

Designed by William Burges, with an impressively medieval appearance, working portcullis and drawbridge, and sumptuous interiors which rival those of Cardiff Castle, it has been described as "the most spectacular example of (that architect's) translation from High Gothic into High Victorian." (Wikipedia)