Paul Theroux describes what a trip the length of Africa taught him, 40 years after serving with the Peace Corps in a village in Malawi. Frugal Traveler Seth Kugel tells us what it was like to spend a week in a small Mexican town he picked at random, off the tourist grid. And Neil Taylor explains how much the Baltic countries have brightened up in 20 years, since they shook off Soviet Communism.