Sample url: http://video.nationalgeographic.com/video/news/150210-news-crab-mating-vin?source=featuredvideo
nationalgeographic is an video streaming site that features tons of
videos for you viewing pleasure.
The site has an Alexa rank of 1219, which is considered to be quite good.
To download nationalgeographic videos you can't use the dl-trick but you can always just copy-paste it or use our bookmarklet shown in the top menu.
More info about nationalgeographic is coming soon.