I have a weakness for places — for old battlefields, car-crash sites, houses where famous authors lived. Bygone passions should always have an address, it seems to me. Ideally, the world would be covered with plaques and markers listing the notable events that occurred at each particular spot. A sign on every pay phone would describe how a woman broke up with her fiance here, how a young ballplayer learned that he had made the team. Unfortunately, the world itself is fluid, and changes out from under us; the rocky islands that the pilot Mark Twain was careful to avoid in the Mississippi are now stone outcroppings in a soybean field. Meanwhile, our passions proliferate into illegibility, and the places they occur can’t hold them. Eventually pay phones will become relics of an almost-vanished landscape, and of a time when there were fewer of us and our stories were on an earlier page. Romantics like me will have to reimagine our passions as they are — unmoored to earth, like an infinitude of cell-phone messages flying through the atmosphere.