Howling Gully

The party's trek over the tundra is interrupted when a sudden blizzard closes in around them. With the temperature dropping, they must find shelter or perish. Nearby, spatters of red blood accompany the massive paw prints of a polar bear which lead to a yawning cavern. Far off, barely visible through the swirling snow, an ancient stone tower looms, a treacherous climb away.

Big thanks to the following builders whose submissions I incorporated:

Eiven's Round Tower

Gengus's Ice Cavern Pass

Petsen's Mountain Cabin

TooHaiku's Old Saint Nick's Workshop

Createmos's Snowy Rocky Outcrop

ReLik's Snowy Mountain Pass

And here is the Haunt I made for the tower in Pathfinder 2nd Edition.