Once the opulent home of opera star Adelina Patti, Craig-y-Nos Castle later became a tuberculosis hospital where many patients succumbed to the disease. Guests and investigators frequently encounter a woman in Victorian dress—believed to be Patti herself—heard singing faint arias near the theater she built on the grounds. Other phenomena include children’s laughter in the upper corridors, a matronly figure who patrols the wards, and temperature plunges in the music room during piano recitals. Thermal imaging and EVP sessions have captured whispers in Italian and Welsh, adding to the castle’s reputation as Wales’s most musically haunted landmark.