According to old Icelandic folk tales, trolls can only travel at night, much like vampires (This is probably hereditary, vampires and trolls likely share a bloodline). As the story goes, once the first rays of sun shine on a trolls skin, it will turn to stone.
The strongest argument in support of these tales are various lava/rock formations that take an eerily troll-like shape in the whimsical autumn dusk, or the summer fog.
Looking at this photo, it is easy to see a group of trolls, having been caught out after light, and paying the ultimate prize.
via againstrrreality:
Reynisdrangur 2002 by Bill Schwab on Flickr.
Reblogged from Inspired by Iceland
