I nominate DYATLOV PASS!
The lack of eyewitnesses and subsequent investigations into the hikers' deaths have inspired much speculation. Investigators at the time determined that the hikers tore open their tent from within, departing barefoot in heavy snow. Though the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue. According to sources, four of the victims' clothing contained high levels of radiation. There is no mention of this in contemporary documentation; it only appears in later documents. Soviet investigators determined only that "a compelling unknown force" had caused the deaths. Access to the area was barred for three years after the incident.The chronology of the incident remains unclear due to the lack of survivors.
Seriously. [http://en.wikipedia.org/wiki/Dyatlov_Pass_incident]
The lack of eyewitnesses and subsequent investigations into the hikers' deaths have inspired much speculation. Investigators at the time determined that the hikers tore open their tent from within, departing barefoot in heavy snow. Though the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue. According to sources, four of the victims' clothing contained high levels of radiation. There is no mention of this in contemporary documentation; it only appears in later documents. Soviet investigators determined only that "a compelling unknown force" had caused the deaths. Access to the area was barred for three years after the incident.The chronology of the incident remains unclear due to the lack of survivors.
Seriously. [http://en.wikipedia.org/wiki/Dyatlov_Pass_incident]