Over the years, many children have gone missing in national parks under odd circumstances. A few notable cases are:

Alfred Beilharz | fplm.org

The bizarre part of this story is the same day Alfred disappears some 2500 feet higher a couple in a different area of the Park are hiking when they hear a sound, not quite a scream but a sound which forced their attention to look up towards it, where they witnessed a small boy walk out onto a ridge look out and then a few seconds later, turn around and walk back out of sight again. The witnesses were stunned, as this area where the boy had been seen was treacherous and extremely high in elevation, this area was a place called Devils Nest.

The next day the couple return home and upon reading the newspaper and seeing the picture of missing Alfred automatically recognise him as the small boy they had seen on the cliff top and call the park.

Keith Parkinsin | DestinationTips.com

He was found less than a day later. The odd thing, though, is that the kid was found 12 miles away from the place where he vanished, a trip that would have required him to surmount not only a variety of waterways and fences, but two mountain ranges as well.

David Gonzales | HowStuffWorks.com

David Gonzales asked his mother if he could have the car keys. There was a box of cookies in the car, and he wanted a treat. The car was only 50 yards away, and his mother watched him as he walked to the parking lot. She turned her back for a second, and when she looked around again, Gonzales was gone.

His mother reported that she heard no sound at all when her back was turned, though she did see a beige truck speeding out of the campground around the time that her son went missing. Since there were no signs of abduction, authorities did not pursue that lead.

David Paulides, a retired police detective, noticed a startling number of children going missing from national parks. Among these cases, he noticed odd similarities.

From EpochTimes.com:

They are clustered in certain areas, particularly around bodies of water and in national parks. If the people are found alive, they often have memory loss. If they are found dead, the cause of death is hard to determine. The people are sometimes found in an area it seems they could not have reached by foot, or they are found in a location that has already been thoroughly searched.

Paulides gave the example of a little boy whose body was found lying on a fallen tree trunk. This tree was lying across the trail searchers had taken for days before the body appeared there.

People are often missing clothes and shoes. Search and rescue dogs are strangely unable to pick up the scent, Paulides said. Some canine handlers have told Paulides their search dogs act strangely, walking a little ways, circling, then sitting down.

Another odd thing to note is the seemingly random appearance of Army Green Berets in some cases. From VeteransToday.com:

McCarter also remarked in his interview with Paulides about how strange the arrival on the scene of the Green Berets was. They were supposedly training in the area, but no one could confirm where, and no one in the Park Service admitted to knowing anything about their deployment in the search. They just showed up in choppers about a week into it, carrying their own equipment and their own communication systems.

Paulides filed many FOIA requests for various cases and, of course, didn't get much in the way of help. Yosemite National Park Service gave a particularly startling reply:

Working in concert with four other retired law enforcement personnel, Paulides filed an FOIA request with the park service asking for a list of people that have gone missing in Yosemite. The park service replied that they kept no such lists. As ex law enforcement officers; Paulides and company immediately grasped the breathtaking level of negligence required for the park service not to keep such lists and the unlikelihood of such incompetence existing in a federal agency of the NPS’s stature.

They filed their FOIA again, rewording it in case it was a question of semantics. The chilling response of the NPS western regional director was a blanket denial of such a list existing at either the park level or the national level. Paulides quotes her as saying “we rely on the institutional memory of our employees to help us on missing people and to understand the magnitude of it at different parks.”

Paulides then sent her a letter stating that he was a published author that had requested an exemption. He was entitled by law to a list utilizing the resources she had just quoted. The park service responded that his books were not carried in enough libraries to get an author’s exemption and they would have to go into the archives and formulate a list and that would cost him thirty-four thousand dollars. That would be for a list of missing people in Yosemite. For the entire park system, Paulides was told he would have to pay 1.4 million dollars.

Paulides started CanAmMissing.com, which has a lot of interesting information regarding these disappearances, for anyone wanting more information.

Paulides noticed that certain national parks were hotspots for missing children; he referred to them as clusters. I found a map of the clusters here: Map

When I saw that map, I was immediately reminded of a map of the underground US military tunnels that I had come across before. Here it is: Map

They're almost exactly the same!

One person reports having heard children crying out for help while visiting Droop Mountain Battlefield Park in West Virginia here. Droop Mountain has tunnels and an underground bunker, as discussed here and here. Possible confirmation that tunnels and underground bases are being use to transport and potentially store children for various reasons? Trafficking, Bohemian Grove-like rituals, and experimentation come to mind for me.