Crowned by snowy fog, a nunatuk, or mountain peak rising from a plane of ice, looms over South Georgia Island in the South Atlantic Ocean. This icy crest was first crossed in 1916 by Ernest Shackleton and his Antarctic crew—and was soon crossed again by a team sent to rescue them.

(Photo shot on assignment for, but not published in, "Shackleton: Epic of Survival" November 1998, National Geographic magazine)