A climber moves along the steel cables on the Fressinieres via ferrata, above the Fressinieres valley, near Briancon, Ecrins Massif, western Alps, Hautes-Alpes, south east France, Europe

A climber crossing the steal rope bridge in Glen Nevis, Scotland, United Kingdom, Europe

A climber crossing the steal rope bridge in Glen Nevis, Scotland, United Kingdom, Europe

Mountaineers on the way through Höllental to the Zugspitze - Höllental via ferrata in sunrise

Trial biker on steel rope at Danube River, Linz

Steel cable fixing of a suspension bridge, Friedrich-Ebert-Bruecke, Duisburg, NRW, Germany

Little girl in ballet shoes balancing on a steel cable just above the ground

The Second Severn Crossing, Ail Groesfan Hafren, bridge over river Severn between England and Wales, United Kingdom, Europe

Train, power car with pantograph, writing "Sicherheitskontrolle" security check, composing

Young man, hiker secured to a steel rope climbing a rock face, Via Ferrata Francesco Berti, Sorapiss circumnavigation, Dolomites, Belluno, Italy, Europe

Landschaftspark Duisburg-Nord park, Duisburg, North Rhine-Westphalia, Germany, Europe

Young man, hiker secured to a steel rope climbing a rock face, Via Ferrata Francesco Berti, Sorapiss circumnavigation, Dolomites, Belluno, Italy, Europe

Little girl in ballet shoes balancing on a steel cable just above the ground

Steel suspension bridge, Dudh Kosi valley, Solukhumbu, Khumbu, Nepal, Asia

The oresund or Oeresund Bridge between Denmark and Sweden, Europe

Cable-stayed bridge, bridge pier, pylon, Erasmus Bridge, Erasmusbrug, Rotterdam, Kop van Zuid, Netherlands, Europe

Cable-stayed bridge, bridge pier, pylon, Erasmus Bridge, Erasmusbrug, Rotterdam, Kop van Zuid, Netherlands, Europe

Steel suspension bridge, Dudh Kosi valley, Solukhumbu, Khumbu, Nepal, Asia

Steel cable around a tree and damage of the tree

The oresund or Oeresund Bridge between Denmark and Sweden, Europe

Landschaftspark Duisburg-Nord park, Duisburg, North Rhine-Westphalia, Germany, Europe

Erasmus Bridge, Rotterdam, South Holland, Holland, Netherlands, Europe

Hawaii, Oahu, Pearl Harbor, View Of Military Ships

Hawaii, Oahu, Honolulu, U. S. S. Missouri, historic battleship now anchored in Pearl Harbor,