. >> reporter: and then came the day when she was about 13 that she walked into the bucktown villageust as an overseer was trying to catch a runaway. >> when the overseer picked up one of these store weight, a two-pound weight. >> that's heavy. >> yes. and he threw it, intending to hit the young man who was fleeing, but tubman had stepped back into the doorway and it slammed right into her skull. >> reporter: for the rest of her life, harriet tubman had sudden epileptic seizures and visions she said were from god. harriet was her mother's name. minty began calling herself that when she married john tubman. >> in 1849, she escaped from this place. >> reporter: right here? >> right here. >> reporter: a place called popular neck in caroline county, maryland. when word reached her that she was going to be sold south. just look at a map. imagine harriet tubman in her 20s running away alone, on foot. >> so she would have come to this home. >> reporter: she managed with the help of the underground railroad to make it 100 miles to the pennsylvania border and freedom. but then tubman went bac