Now in its fourth season, "Lost LA" explores our region’s hidden past through documents, photos and other rare artifacts from California libraries and archives. This season, discover the untold histories behind Griffith Park, Manzanar, Los Angeles’ prohibition tunnels, architect Paul Revere Williams, the Shindana Toy Company and the Mount Wilson Observatory.

Each episode streams here and is available on the free PBS Video app (available on Roku, Apple TV, Amazon Fire TV, the App Store and Google Play), as well as on YouTube and Amazon Prime.

"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.

FUNDERS | LOST LA CURRICULUM PROJECT