Eight houses will be open from noon to 5 p.m., including an 1865 Mansard Victorian, four Colonial Revivals built between 1903 and 1925, and a 1920 Arts and Crafts house. The tour, sponsored by the Newton Historical Society, will take place in five historic neighborhoods. Tour tickets, $30 (members, $25), will be available at the Newton History Museum, 527 Washington Street (Jackson Street). For advance tickets, $25 (members, $20), and information: (617) 796-1450 and newtonhistorymuseum.org