This is a documentary made by National Geographic on time travel. They include some of the greats in this documentary such as Stephen Hawking and Dr Michio Kaku as they talk about their views on time travel. I am not a big one for documentaries but this is a awesome one. They are even talking about making a time travel machine in the documentary.
https://www.youtube.com/watch?v=au5i1Bw725o
https://www.youtube.com/watch?v=au5i1Bw725o