I'm always in search...in search of the perfect travel bag. Travel alarm. Travel mask. Travel shampoo bottle. Travel map. And, of course, travel books. I keep lists here and there, jotted in journals and pull articles out of magazines every time I see something that I think could occupy me on a plane or a beach and whisk me off to another culture or another era. Now I've come across the so-called "86 Greatest Travel Books of all Time" at a website called Longitudebooks.com. What shall it be? The Arabian desert or the last decade of the Shah of Iran?