About 4,000 people have flooded California's Mojave Desert for the annual post-apocalyptic festival called Wasteland Weekend, and the pics looks out of this world. The festival, which was inspired by the Mad Max film series, is unlike most desert parties because it requires all attendees to be in costume. Yes, even staff members and journalists. The idea is to create a full-immersion effect, making everyone feel like they’re inside a Mad Max universe for 5 days. And it works.