Although the majority of people who visit the Himalayas make trekking, or climbing, the focus of their adventure holiday, overland tours in Nepal and Tibet are equally dramatic and easily accessible. They offer a unique experience as roads twist and wind their way up and down hills and valleys, and to travel by vehicle can be just as exciting as trekking along some of the vertigo-inducing high paths of the mountain ranges. There are only five metalled highways in Nepal, one of which runs up i...