Paul Theroux's challenge

"After prudently having himself circumcised, learning to speak fluent Arabic, dressing as an Afghan dervish and calling himself Mirza Abdullah, the British explorer Sir Richard Burton travelled to the holy city of Mecca, a deeply curious unbeliever among devout pilgrims. This was in 1853. He published his account of this trip in three volumes several years later, his Personal Narrative of a Pilgrimage to Al-Madinah and Meccah. The last non-Muslim to do this and to write about it was Arthur John Wavell, of the distinguished British military family. An army veteran, and farmer in Mombasa, Kenya, Wavell developed an interest in Islam. In order to know more, he disguised himself as a Swahili-speaking Zanzibari, made the pilgrimage and wrote about it in A Modern Pilgrim in Mecca (1912). Wavell took the trip in the winter of 1908-1909, more than a century ago. No unbeliever has done it since. Now there’s a challenge for a technology-smug couch potato who prates that the travel book is over."

More goading here.