Is Corvin Castle haunted?
Romania Reported haunting level 4 of 5

What actually happened
John Hunyadi, who transformed the castle, died during a plague outbreak in 1456 shortly after his victory at the Siege of Belgrade.
The history
The great Gothic castle at Hunedoara was developed in the 15th century by John Hunyadi, one of the leading military figures of his age.
What people report
Its wells, dungeons and prisoner stories generated legends that are now part of the castle's public interpretation.
That paragraph is reported tradition, not a claim about what is there. The history above it is sourced; the stories are recorded because people tell them.
Visiting
Strada Curtea Corvinilor 1-3, Hunedoara 331141, Romania