国家地理：奇闻大揭秘 National Geographic: Is It Real? (2005)认领

　　Season 1 　　1. Crop Circles March 28, 2005 Are crop circles really cryptic messages from alien life forms, or just a rural post-pub practical joke? 　　2. Bigfoot March 28, 2005 Is there a giant primate living in the world's wilderness areas or is Bigfoot just a figment of our imagination? 　　3. Ghosts April 25, 2005 Countless people claim to have seen ghosts - have they real...