January 27, 2012
Cave Painting, Papua New Guinea
Photograph by Amy Toensing, National Geographic
This Month in Photo of the Day: Travel Photos
For generations people in the region have marked cave walls with stenciled handprints. These prints were made with clay-based paint, but in other caves, crimson stains tell the story of a bloody initiation ritual for young men.
See more pictures from the February 2012 feature story "Last of the Cave People."