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A view of the inmates' postal station at Kingston Penitentiary in Kingston

A view of the inmates' postal station at Kingston Penitentiary in Kingston, Ontario October 11, 2013. British North America's first penitentiary, the "Kingston Pen" as it is known, is now closed. Situated on prime real estate on the shore of Lake Ontario, its fate is unknown despite being designated as a National Historic Site. Public tours are currently being held to raise money for the United Way. The prison was once home to Canada's most famous criminals including Canadian serial killers Clifford Olson and Paul Bernardo. REUTERS/Fred Thornhill (CANADA - Tags: CRIME LAW SOCIETY)

Inside Kingston Penitentiary

This October, the notorious 'King Pen' closed its doors, but not before people clamoured to get tickets to see what it looks like inside. While it was for a good cause (the proceeds went to charity), you can check it out for free in this gallery.