El Caminito Del Rey in Spain is certainly for the stout hearted.
From Wikipedia
El Caminito del Rey (English: The King’s little pathway) is a walkway or via ferrata, now fallen into disrepair, pinned along the steep walls of a narrow gorge in El Chorro, near Alora in the district of Malaga, Spain. The name is often shortened to Camino del Rey.
In 1901 it became obvious that workers at the hydroelectric power plants at Chorro Falls and Gaitanejo Falls needed a walkway to cross between the falls, to provide for transport of materials, and for the inspection and maintenance of the channel. Construction of the walkway took four years and it was finished in 1905.
In 1921 King Alfonso XIII crossed the walkway for the inauguration of the dam Conde del Guadalhorce and it became known by its present name.
The walkway is one meter (3 feet and 3 inches) in width, and rises over 100 meters (350 feet) above the river below. It is currently in a highly deteriorated state and there are numerous sections where part of or the entire concrete top has collapsed away. The result is large open air gaps that are bridged only by narrow steel beams or other support fixtures. Very few of the original handrails exist but a Via ferrata safety-wire runs the length of the path. Several people have lost their lives on the walkway in recent years and after two fatal accidents in 1999 and 2000, the local government closed both entrances.
Even though the government has closed the trail, climbers still walk the path.
This video is NOT for anyone with acrophobia. I do ok with heights, but this vid makes me a bit queasy.