The National Park Service offers a self-guided walking-tour map of the Black Heritage Trail as well as, in the summer, daily guided tours; the African Meeting House, at 46 Joy Street, is open Monday through Friday from 10:00  A.M.  to 4:00   P.M.  Call 617-742-5415 or see   www.nps.gov/boaf/  for information. The Memorial Transept, at Harvard, is generally open to the public on weekdays from 9:00   A.M.  to 6:00   P.M. ; call 617-496-4595 or see   www.fas.harvard.edu/∼memhall . Mount Auburn Cemetery (617-547-7105), at 580 Mt. Auburn Street in Cambridge, is open from 8:00   A.M.  to 5:00   P.M. , seven days a week. For information on lodgings and more, contact the Greater Boston Convention & Visitors Bureau, at 888-SEE-BOSTON or   www.bostonusa.com , or the Massachusetts Office of Travel & Tourism, at 1-800-227-6277 or   www.mass-vacation.com .