The dirt road that connects Pakistan’s remote town of Wana with Afghanistan is lined with walled compounds. They form the outermost ramparts for Osama bin Laden’s hideaway of forests, mountains, and ravines, local residents and officials say. The compounds are believed to be part of the concentric circles of defense that insulate senior Al Qaeda leaders, giving them plenty of early warning in the event of a ground assault here. Although US officials say they have set their sights on a 20-square-mile section within this northwestern region of South Waziristan, they face a number of obstacles to going after America’s Enemy No. 1. Full Story