Popsugar Entertainment Hbo Best HBO Documentaries | 2020 25 Powerful Documentaries You Can Watch on HBO Right Now 7 April 2020 by Hedy Phillips View On One Page Photo 2 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Song of Parkland Despite tragedy, the students at Marjory Stoneman Douglas High School will give you hope in this documentary. Watch Song of Parkland on HBO. Previous Next Start Slideshow HBODocumentaries