Where is the haunted house of the island of Poveglia?

Poveglia Island is located in the lagoon of Venice, Italy. Based on what I've read and seen (and there's very little), the entire island is haunted. First used as an isolation location for plague victims, then became (in the early 1900s) a mental institution. It was closed, and then under the stewardship of Italy. A couple of times some of the wealthy cognoscenti have tried to purchase it and convert it to a vacation destination for their families, but have been unsuccessful due to the purported hauntings.

See the episode of "Scariest Places on Earth", shown on SCIFI channel. It's been the best source of info for the island that I've been able to find.