Eventually this was replaced by the road which switchbacked up to the summit and was capable of supporting 20-ton mining trucks.
The course, which follows a switchback-style path, does not allow for a large number of runners and throughout its history no more than thirty athletes have taken part in each competition.
The second half presents views of Aguas Calientes and the Urubamba River valley, as the trail ascends the eastern face of Phutuq K'usi in switchback fashion.
Via Krupp is a historic switchback paved footpath on the island of Capri, connecting the Charterhouse of San Giacomo and the Gardens of Augustus area with Marina Piccola.
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It can be reached via Myriokefala, Asi Gonia or Asfendos, or via a recently paved road with more than 25 tight hair-pin turns, which starts in Kapsodasos and offers stunning views of the Frangokastello plain and the Libyan Sea in the distance.
On the east side of the Jemez Mountains, it descends even more steeply, on a series of hairpin turns offering spectacular views into Frijoles Canyon in Bandelier National Monument, to a junction with NM 501 (NM 502 in some references, but NM 501 is correct) leading east into the town of Los Alamos.
The Ledo Road began at Ledo, the railhead, and passed through Lekhapani, Jagun, Jairampur (the Assam-Arunachal Pradesh boundary and beginning of Inner Line), and Nampong before switchbacking steeply upwards through densely forested hills to the pass, 12 km away.