With three days left to go in my trip, I was walking around Havana flat broke.

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There was someone playing tennis, a trip to the dentist, walking down New York City streets and hanging out with friends.

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Imagine walking the streets of an unfamiliar city on a business trip, calling up an address from a list of contacts and then getting a map showing your location and the location of where you're going.

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Martin, 17, was walking to the house of his father's fiancee after a trip to a nearby convenience store.

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If you trip going down the stairs, get up and keep walking.

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Memmer had noticed before the trip to the amusement park that he would get winded walking up the stairs in his home and had trouble keeping up with his kids while they were playing.

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At first, it seemed fairly black and white: Trayvon, an unarmed 17-year-old, was walking to the home of his father's fiancee after a trip to the store for candy and tea when Zimmerman, the neighborhood watchman, saw him and called Sanford police's nonemergency line.

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Mr. Marlantes puts you in the heads of scared young men walking blindly in column through head-high grass in terror of trip-wires and ambush by enemies fighting on their home turf, or hacking their way through impenetrable bush overwhelmed by fatigue, jungle rot, fear, sickness, tigers and leeches.

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Scott describes her as untiring, walking through heat and rain without complaint, staying up late after a field trip to transcribe notes and meeting her deadlines.

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It begins with his near-fatal car crash in 1999 on a fishing trip in the outback of Australia, an event that crippled his walking for the rest of his life, and then flashes back to his upbringing in a prominent Sydney family, which educated him at Jesuit schools and sharpened his antiauthoritarian edge.

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But the experience of walking in and out of history is exhilarating by itself, and well worth the trip for its own sake.

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