I realize the movie's 3 years old, but it seems much more relevant now after just a few years.
-Same director as GoT episode 'Blackwater'
-Davos Seaworth's in it (also Dominic West and TWD Governor)
-Tons and tons of those awesome nordic landscapes like the ones seen north of the Wall in GoT s2 & s3
-...and in Vikings. Let's be honest, it's not a bad show but that's the coolest part about it
-The Celtic people it's mostly about are the Picts, who lived in Scotland, and though they're not pillaging in longboats, they're depicted as extremely viking-esque
It's spot-on for everything we've been seeing in this recent GoT/Vikings/Skyrim trend. From the icy landscapes to the settlements and structures, tattooed Nordic savages and even Serpent Stones.
I searched and didn't find a thread but figured it deserved one, if only to make the recommendation more visible.