If you can watch only one, watch The Abolitionists

http://www.amazon.com/American-Experience-Abolitionists/dp/B00A3THVGE/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1374944644&sr=1-1&keywords=the+abolitionists

 

Other documentaries worth watching:

http://www.amazon.com/Life-Sojourner-Truth-Aint-Woman/dp/B001E6TE6U/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1374944856&sr=1-1&keywords=sojourner+truth

http://www.amazon.com/Underground-Railroad-History-Channel-Woodard/dp/B00007GZYD/ref=sr_1_2?s=movies-tv&ie=UTF8&qid=1374944656&sr=1-2&keywords=underground+railroad

http://www.amazon.com/Underground-Railroad-William-Still-Story/dp/B00652U6AQ/ref=sr_1_3?s=movies-tv&ie=UTF8&qid=1374944656&sr=1-3&keywords=underground+railroad

http://www.amazon.com/Harriet-Tubman-Underground-Railroad-Dimension/dp/B005LRQHKO/ref=sr_1_20?s=movies-tv&ie=UTF8&qid=1374944703&sr=1-20&keywords=underground+railroad

http://www.amazon.com/American-Experience-Resistance-Underground-Railroad/dp/B000A0GYLE/ref=sr_1_23?s=movies-tv&ie=UTF8&qid=1374944703&sr=1-23&keywords=underground+railroad

http://www.amazon.com/Whispers-Angels-Story-Underground-Railroad/dp/B0001HYDDM/ref=sr_1_25?s=movies-tv&ie=UTF8&qid=1374944731&sr=1-25&keywords=underground+railroad

http://www.amazon.com/Up-Slavery-Kevin-R-Hershberger/dp/B0058KGHX6/ref=sr_1_28?s=movies-tv&ie=UTF8&qid=1374944731&sr=1-28&keywords=underground+railroad

http://www.amazon.com/American-Experience-John-Browns-Holy/dp/B000E0OBCE/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1374944754&sr=1-1&keywords=john+brown

http://www.amazon.com/Americas-Journey-Through-Slavery-Abolitionist/dp/B00133MKTC/ref=sr_1_9?s=movies-tv&ie=UTF8&qid=1374944778&sr=1-9&keywords=abolitionist

http://www.amazon.com/Biography-Frederick-Douglass-DVD-Archives/dp/B0007WFUMO/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1374944826&sr=1-1&keywords=frederick+douglas

http://www.amazon.com/Slavery-By-Another-Name/dp/B006JN86VW/ref=pd_cp_mov_2

http://www.amazon.com/500-Years-Later-Paul-Robeson/dp/B000YGE18C/ref=pd_bxgy_mov_text_z

 

Fictionalized accounts:

http://www.amazon.com/Roots-Seven-Disc-Anniversary-Levar-Burton/dp/B005CGI4O6/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1374944962&sr=1-1&keywords=roots

http://www.amazon.com/Race-Freedom-Story-Underground-Railroad/dp/B0000560WB/ref=sr_1_4?s=movies-tv&ie=UTF8&qid=1374944656&sr=1-4&keywords=underground+railroad

http://www.amazon.com/Woman-Called-Moses-Cicely-Tyson/dp/B0000560W6/ref=sr_1_6?s=movies-tv&ie=UTF8&qid=1374944656&sr=1-6&keywords=underground+railroad

 

Specifically for kids:

http://www.amazon.com/Follow-Drinking-Gourd-Underground-Railroad/dp/B009D4GY4U/ref=sr_1_10?s=movies-tv&ie=UTF8&qid=1374944656&sr=1-10&keywords=underground+railroad