This is a big and useful resource-DocumentaryHeaven.
For people like me, who like to entertain themselves with documentary films, Documentary Heaven is the best place online.
Some of the films that I always wanted to see are "Who built Stonehenge" and El Dorado" and as per Documentary Heaven, both are available with them and they are on the list of most watched documentary films.
All the documentary films are arranged in a big list of categories that are literally from A to W. (yes, there are no entries on (X, Y and Z.)
Hello, there is no payment to watch buddy. It is all free.