In 1947, Arnold Toynbee appeared on the cover of Time magazine. At the time, he was the world's most renowned scholar, author of the monumental ten-volume A Study of History, praised by the historian William Hardy McNeill for “taking all the knowable human past as his province” and finding “rhythms and patterns which any less panoramic view could scarcely have detected.” Toynbee's reputation soon plummeted when historians turned away from studying big ideas to nibble away at small-scale trends. But his unique perceptions still are relevant. Decades ago, he recognized that “two relatively small patches of geography”—one in “the Oxus-Jaxartes basin,” i.e. Afghanistan, and the other in Syria—have been “roundabouts” where the traffic of civilizations and religions across the world come together, jostle, and collide at exceptionally close quarters. Just as Afghanistan has proven elusive to conquer and tame over the years, so too is Syria a place of chaos and instability, which is today sucking the great powers of the world into its whirlwind.