Originally a Roman fort, later rebuilt by Normans and Victorian industrialist Lord Bute, Cardiff Castle has nearly two millennia of layered hauntings. Guards have seen a spectral soldier in Roman armor along the old wall at dusk, while visitors to the clock tower report phantom footsteps and sudden cold drafts. The most persistent presence is that of Lady Sophia, a 19th-century noblewoman said to wander the library searching for a missing locket lost before her death. Maintenance workers have heard harpsichord music drifting from the banqueting hall long after closing, reinforcing the castle’s quiet reputation as one of Wales’s most elegant but unsettled landmarks.