His brother Ric Burns made a documentary about the Donner Party. It really is a masterpiece of non-fiction horror.

Unfortunately it's unavailable for streaming. Every time someone uploads it, it gets taken down.

This Peabody Award clip is all that's available. The DVD can be had for cheap on Amazon.

https://youtu.be/w-eTjCuNDoE

https://film.avclub.com/the-most-terrifying-pbs-special-of-a...