The oldest and one of the largest genealogical societies in the U.S. has been dedicated to “collecting, preserving and interpreting” annals of family and local history and genealogical records since its founding in 1845. The society boasts expert researchers and archivists and a collection of more than 200,000 books, periodicals and microform materials, as well as more than 1 million manuscripts. Monthly orientations and tours. Open Tu and Th-Sa 9 am-5 pm, W 9 am-9 pm. Non-members: $20.