Preston Castle located in Ione California recently was investigated by the Ghost Trackers Paranormal Research Group.

The Preston School of Industry was established by the California State Legislature as a progressive action toward rehabilitating, rather than simply imprisoning, juvenile offenders. The building was built in 1890. First residents were housed in 1894. The Preston School of Industry remained open until 1960 when new facilities for the school were completed. The building remained vacant and fading into disrepair until September 10, 2001 when The Preston Castle Foundation received a fifty-year lease for the property.

Here is 1 recent public photo from Flickr.com

The Ledger-Dispatch has an article on the investigation:

The Ghost Trackers’ Sharon Leong, and her sister, Anne, felt there was still a good chance they’d identify paranormal activity once they took their recordings and video back home and examined them with technology that could amplify and break down the data. “A lot of times you don’t hear anything at all when you’re recording audio,” Sharon said. “And then when you turn it up on your computer you hear what are sometimes clearly voices too faint for the human ear. That happened to us a couple of months ago when we were at Alcatraz Island. We asked a question and didn’t hear anything; but then once we got home and turned the audio up, we heard a very frightening response.”

Several days after her trip to Preston Castle, Anne realized she might have been standing near enough to the group of people who heard the humming to have caught it on her camcorder. “It’s there,” she confirmed to the Ledger Dispatch. “The humming was faint and I had to use the headphones to hear it, but it was definitely a man humming.”