Top 10 Most Difficult Documentaries Ever Filmed

When it came to making these incredible documentaries, the process was anything but seamless. For this list, we’ll be looking at any non-fiction film that was considered hard to make. Our countdown includes "Free Solo", “Hearts of Darkness: A Filmmaker’s Apocalypse”, “The Act of Killing”, and more! Did we miss one of your favorite documentaries? Let us know in the comments below.