PBS | 10:00 pm

The winner of the World Documentary Grand Jury Prize at this year’s Sundance Film Festival, "Last Men In Aleppo" details the situation in civil-war-torn Syria as it existed in 2015, four years after the country’s government began its pushback to the Arab Spring protests. Volunteers known as The White Helmets risked their own safety to help residents of areas overtaken by rebels. A caution to viewers: Some of the aftermath of violence is shown in graphic detail here.