You've read about the Holocaust in books and seen it portrayed in films. But it's another experience entirely to walk through the site of a concentration camp in virtual reality, led by a survivor who lost his entire family there. The Last Goodbye, which debuts at the Tribeca Film Festival this week, follows Pinchas Gutter as he makes his final pilgrimage to Majdanek, a former Nazi Germany extermination camp in occupied Poland. It's a trip he's made many times, but this one has a specific purpose: to capture his account of the Holocaust so we never forget that it actually happened.