The first English edition of Badia y Leblich's account of his travels across the Muslim world, from Morocco to Mecca, disguised as an a Arab called Ali Bey el Abbassi. His disguise (he was even circumcised) enabled him to access places forbidden to non-believers, including Mecca, though his real identity was suspected by the time he reached Constantinople. His expedition was supported by the Spanish authorities, to whom he made reports on his travels.