C-SPAN celebrated its 10th anniversary in 1989 with a three-hour retrospective, featuring Lamb recalling the development of the network.[16] The 15th anniversary was commemorated in an unconventional manner as the network facilitated a series of re-enactments of the seven historic Lincoln-Douglas debates of 1858, which were televised from August to October 1994, and have been rebroadcast from time to time ever since.[26] Five years later, the series American Presidents: Life Portraits, which won a Peabody Award, served as a year-long observation of C-SPAN's 20th anniversary.[27][28]