The Russian military is stepping up its attacks on residential areas of besieged cities in Ukraine.  Today, Russian and Ukrainian authorities appeared to take steps toward setting up safe corridors for civilians to evacuate from six cities in the east and south. And the historic city of Lviv features cobblestone streets, ornate churches, and the Lviv Theater of Opera and Ballet.  Today, its residents are rushing to protect these cultural treasures, as they watch the Russian military's continued assault on several cities. Plus, we hear from the granddaughter of Tom Crean, the navigating officer on Ernest Shackleton's found ship The Endurance. She continues his legacy by retracing Crean's expedition.