The towering Mercer Museum houses dramatic displays of the implements, folk art and funishings of early America before mechanization.  Walk into the Central Court and see a Conestoga wagon, whaling boats, carriages and antique fire engines suspended overhead.  There are 40,000 tools of more than 60 early American crafts and trades displayed.  Constructed in 1916, it is a National Historic Landmark.  Gift shop.  Call for research library hours.  Hours: Mon, Wed-Sat 10 a.m. - 5 p.m.; Tue 10 a.m. - 9 p.m.; Sun noon - 5 p.m.