Three-vine bridge near Askole, Pakistan
Imagine braiding thousands of weeping willow strands into 3-cm. ropes, then twisting several ropes into three 15-cm. hawsers. The hawsers become the tread and handrails of the bridge, with more of the smaller strands tying them together.
This bridge connected two villages across the Braldu River, 2 days' walk downstream from the Baltoro Glacier. The bridge has since been replaced with a more modern version.
Don't tell anyone, but this is an illegal picture. Because of the border conflict with India, bridges in Baltistan are considered strategic military assets, and photographing them is prohibited.
Photo taken by Bill Noble in June, 1988. (I was out on the bridge - the guy on the left.)