Keen hikers and nature lovers will no doubt have heard of the Tonto National Forest, the fifth-biggest national forest in the entire United States. Covering almost three million acres, the scenery in this Arizonan gem on offer is simply spectacular. Rugged and wild, there's almost no other place on earth quite like it. How could something so beautiful hide something so potentially deadly?
While the majority of the park is open to the public, the authorities have seemingly still managed to hide a possible alien hideout. The dense pine forests and often dizzying elevations help, but its proximity to Phoenix, and therefore human civilization, make it seem like the worst place on Earth to hide. But then again, you wouldn't have thought Malibu could be hiding extra-terrestrial life, either.