"Lost LA" explores the past through the region's archives, where photos, documents, and other rare artifacts unlock the untold history behind the fantasy of Southern California. Hosted by writer and public historian Nathan Masters of the USC Libraries, each episode of "Lost LA" brings the primary sources of history to the screen in surprising new ways. Much of L.A.'s past is lost to history, but through the region's archives, we can uncover the inspiring dreams and bitter realities that built the modern-day metropolis.