Street walking -- called the oldest profession -- has somehow been transformed into an extreme sport. Ask Haight-Ashbury's Larry Burgheimer, who has walked every street in San Francisco. Or Jeff Ingram, whose street walk was "75 percent complete" at last check. I'm halfway there myself. And the Castro's Dinah Sanders says she's perambulated 15 percent of the city's streets.
Since starting my quest in 2002 to walk every street in San Francisco, I've heard from others who have done their hometowns, too: People around the world, from Amsterdam to New Zealand, are walking every street on the map . . .