Around 400 suitcases that belonged to former patients, most of whom never left the hospital, were found at the asylum in 1995.
They date from 1910 to 1960. Those who died there were buried in numbered but nameless graves.
There is a tour for visitors usually every May but it was canceled last year due to safety concerns.
The asylum has since been known as Destination Fear and a haunted location where unexplained screams have been heard.