Straight gravel road cutting across grassy plain near Windhoek, Namibia

Mountains and gravel plain, Sossusvlei area, at dusk, Namib-Naukluft, Namibia, Africa

Gravel road and Hawkdun Range, Ranfurly, Central Otago, South Island, New Zealand, Pacific

Four by four vehicle in the distance on long straight gravel road, blue mountains in the background, north of Solitaire, Namibia, Africa

Straight, snow-covered road leading towards a mountain, winter landscape, Lomagnupur, Skeioararsandur, South Iceland, Iceland, Europe

Hole in the rock, Jebel Uweinat, Jabal al Awaynat

Man looking through a hole in the rock, Jebel Uweinat, Jabal al Awaynat, Libya

A railroad extending through the desert, near Wendover in Utah, Umatilla County, Oregon, USA