Nikolay Przhevalsky

"Between November 1870 and September 1873, accompanied by only three men and with ridiculously small pecuniary resources, he crossed the Gobi desert, reached Peking, and, pushing westwards and south-westwards, explored the Ordos and the Ala-shan, as well as the upper part of the Yangtsze-Kiang. He also penetrated into Tibet, reaching the banks of the Di Chu river. By this remarkable journey he proved that, for resolute and enduring men, travelling in the central Asian plateaus was easier than had been supposed."

"No amount of adventure satisfies a traveler, and Prejevalski was not satisfied with the excursions he had already made."