10 Mysterious Disappearances in National Parks

Larry Jeffrey, 1966
Mount Charleston is a short drive from Las Vegas, Nev. © Natalie Tepper/Arcaid/Corbis

Larry Jeffrey disappeared near the peak of 12,000-foot (3,650-meter) Mount Charleston in Humboldt-Toiyabe National Forest, just a short drive from Las Vegas. The search began immediately after the boy wandered away from his brothers, and within days the National Guard and a team of bloodhounds had joined the search [source: Associated Press].

In a TV interview, David Paulides told reporter George Knapp, who also hosts the "Coast to Coast AM" radio show, that there were no predators afoot that day, and since the area they were in was pretty secluded, it's easy to rule out an abduction by car. "This boy just walked into oblivion," Paulides said.

When Jeffrey disappeared, he was wearing light clothing, and authorities were doubtful that he could survive the cold temperatures at night. Searchers found and lost the trail a few times, and they discovered evidence that the boy had been eating insects and foraged berries along the way [source: Henderson Home News]. Overall, around 1,000 people searched for 16 days but never found him [source: Knapp].