Three incredible stories about the parallel dimensions that may exist alongside our own: While hiking in a New York state park, a woman has a terrifying encounter with a mysterious human-shaped shadow she believes is an entity from another world; in a New Jersey suburb, a weird machine transports a six-year-old boy and his father hundreds of miles in a split second; and, discovered in Belize and Mexico, perfectly-carved ancient crystal skulls are thought to be cosmic gateways to another realm.