The Red Castle (Castell Coch) situated on a hillside above the village of Tongwynlais, to the north of Cardiff, Wales.

Castell Coch is a 19th-century Gothic Revival castle built on the remains of a 13th-century fortification. It is a Grade I listed building

 Designed by William Burges, it has a superficially medieval appearance, working portcullis and drawbridge. Its sumptuous interiors rival those of nearby Cardiff Castle.