Its fame emanates from its role in housing the most notorious prisoners of an era, yet Alcatraz boasts a long and eclectic history. KQED explores it all in a walking tour of the island, beautifully taped in high-definition format. Host Greg Sherwood joins National Park Service ranger John Cantwell and other experts as they explore the ruins where Civil War soldiers protected California's gold from Confederate plots, see where Native Americans made a thrilling statement for self-determination and uncover much more of the island's surprising past.