Decayed Tower

Once, this might have been a beautiful tower, made of pristine white stone that glimmered in the sunrise. Now, it's a wreck. Hidden deep in the swamplands of Wild Forest, this tower's walls are caving in, the roof is all but gone, and the bright banners have become torn and faded. A flight of precarious half-rotted wooden steps lead up to the top chamber. Inside is a single window, set to the sunset. The tower is musty and dark, dangerous for all but the most able-bodied wolves. A point of interest lies in the top chamber. One of the walls is covered in strange glyphs that no wolf can decipher. Seen in the glyphs are rough imitations of wolves, snowflakes, the sun, and other cryptic symbols. It reminds one of the similar ruins to the north.

But who made these two structures?