Careful restorations have returned Detweiler Meetinghouse — Ontario’s only surviving stone Mennonite meetinghouse — to its 1855 appearance, from its 12-pane window sashes to its original pine floors. The adjacent historical Roseville Cemetery has been in use since 1833. During Doors Open, tour the building, stroll the grounds and enjoy this rare and beautifully preserved site in a serene rural setting.