This weekend (May 1 and 2), as part of Doors Open event in Hamilton, Toronto and surrounding areas there's going to be free admission to various historical sites in Hamilton, Toronto and GTA. McMaster University is also participating in this event, so there will be guided tours to various facilities on campus including Nuclear Reactor at McMaster. Here's the link to Doors Open website: http://doorsopenhamilton.ca/.
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Doors Open Program is back this year. Some of the attractions are below. More information can be found on their website.
Ancaster
Ancaster Old Township Hall:
Ancaster's Shaver Homestead:
Enerals Griffin House:
Fieldcote Memorial Park & Museum / Farmer Home :
Dundas
Westfield Heritage Village:
Hamilton
Art Gallery of Hamilton: