Detweiler Meetinghouse 3445 Roseville Rd., Roseville, www.detweilermeetinghouse.ca, Built 1855, Careful restorations have returned Detweiler Meetinghouse, Ontario’s only surviving stone Mennonite meetinghouse, to its 1855 appearance, from its Georgian hand-blown glass windows to its original pine floors. Lively acoustics make it attractive as a live performance venue, and it is available for milestone occasions, weddings and reunions. The adjacent historic cemetery is still in use.