Twin inukshuks on Devon Island. On the left is the Challenger Inukshuk on the right is the memorial to a member of the Columbia crew.
"To honor the memory of the seven astronauts of Space Shuttle Columbia's last flight, and at the suggestion of our colleague Keith Cowing of SpaceRef, the NASA Haughton-Mars Project (HMP) has established seven astronaut memorial sites on Devon Island, in the Canadian High Arctic, during the summer field seasons of 2003 and 2004. Each site was chosen for its special significance in the NASA HMP's analog exploration program near Haughton Crater, and is marked by an Inukshuk, a traditional Inuit "Stone Person". The Inuit erect Inukshuks to mark land and to guide and comfort travelers on perilous journeys across the Arctic."
"I asked Joe Amaraulik if anyone had ever figured out how long these structures would last. He said he wasn't sure if they had been dated but that there were some that had been in place for many centuries. As for how long this one, which we had just built, would last, Joe (a man of few, but well-chosen words) said "forever". In other words - the next ice age."