Temperatures dropped below −70 °F on the grueling journey.
In the face of death, these ordinary citizens did extraordinary things.
By Olivia Mason
Venture below the surface for our planet's most spectacular views.
The explorer's disappearance continues to fascinate.
Across the unforgiving landscape of Antarctica are deserted outposts haunted by the ghosts of the past.
They set off into uncharted territory and were never seen again.