Travel is often called broadening, exhilarating, or challenging. But there are moments when your mouth is agape and you just know you are a foreigner. I have arrived in Cairo, several hours ahead of Toby. Diane Tayeby, an intern at my office last year but who now lives here, invited me to join her and some friends at a performance of whirling Dervishes tonight. This was quickly arranged: I landed, made my way to the hotel (through Cairo's rush-hour traffic that...