One August morning, I walked out of my Seville home taking nothing but a small, roll-aboard bag, a EuRail pass, and my husband. We were traveling with no fixed time limit, no reservations, and only a loose idea of our itinerary. Our goal was to see if we could still have the kind of spontaneous adventures we'd enjoyed in our youth. We spent three months on trains, mostly in Eastern Europe, and the results - often hilarious, occasionally harrowing, definitely life-changing - form the basis of my new book, Adventures of a Railway Nomad: How Our Journeys Guide Us Home.