Dark Souls lore speculation and theories can go really deep, which just shows how dedicated the series' fanbase is.
The "Shrine of Amana" is one of the most beautiful and mysterious places in Dark Souls II, with only a few scattered around in-game about its lore and background. But Souls veteran Vaati has it all, with a little fan-speculation added, squeezed into a really well-edited video.
Minor spoilers ahead, although you're not really supposed to know anything about the place on your first playthrough, anyway. The thing I remember the most going through this part is that the enemies hit hard and are really annoying.
Dark Souls 2 Lore The Archdrake Sect [VaatiVidya, YouTube]