Craig-y-Nos Castle (English: Rock of the Night), is a Victorian-Gothic country house in Wales. Built on parkland beside the River Tawe in the upper Swansea Valley, it is located on the southern edge of Fforest Fawr in Powys. The former estate of opera singer Adelina Patti, part of the complex is now used as a boutique hotel, catering, conferencing and entertainment venue.