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 17 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 17 Bowling For Columbine This documentary from the '90s took an early look at gun culture in the US, following the high school shooting in Columbine, CO. Watch Bowling For Columbine on HBO. Previous Next Start Slideshow HBODocumentaries