After each stage, they can mark the route on the map with a pencil.

After three years, during which surveyors sometimes had to rappel down the mountain's cliffs to mark the route, construction began in 1916.

Several more streams and a cavernous tree bole mark the route.

The suggestion was accepted, and funding of $300,000 was available to research, mark a route and print guidebooks.

The old bridge was dismantled, but the abutments for it remained visible at each end, and overhead power and telephone lines continued to mark the route.