Dyatlov Pass

We had strayed into some region or some set of conditions where the risks were great, yet unintelligible to us; where the frontiers of some unknown world lay close about us. It was a spot held by the dwellers in some outer space, a sort of peep-hole whence they could spy upon the earth, themselves unseen, a point where the veil between had worn a little thin.

Algernon Blackwood, “The Willows” (1907)