Frontera NorteSur &nbsp;&nbsp;&nbsp; Back in the summer of 2010, Mexican Tourism Secretary Gloria Guevara stood before a crowd in Beverly Halls and proclaimed a new strategy to recapture US visitors. In a speech, Guevara stressed the myriad cultural amenities her country offers tourists. &nbsp;&nbsp;&nbsp; &ldquo;Mexico has 29 sites that are patrimonies of humanity, 62 ethnic [...]