What kind of movies to get a 14 year old boy?

my nephew is 14 and into documentaries.he loves the show dual survivor and whale wars and myth busters.he watches a bunch of the stupid kid shows the have on tv and like them.he likes the show hercules the legendary journies.he likes the show bones.i am trying to think of something to get him for christmas that would be on dvd on amazon.i got a list going on what i could get him.i got all those on the list of ideas.so what other ideas you got for me to do for him.his mother does not allow him to watch horror movies or anything with a lot of adult content