Evidence: The Sphinx is a natural rock formation in the Bucegi Natural Park located at an altitude of 2,216 metres (7,270 ft) which is in the Bucegi Mountains of Romania. It is also true that the area contains a variety of caves and caverns.
Claim explanation: The claim of Holographic library (Holographic control panels) of the Earth's past history under the sphinx is based on time travel science fiction from a book called Transylvanian Sunrise by Peter Moon and Radu Cinamar. Peter Moon further claims that the chamber beneath the sphinx is only accessible if an alien being wants you to access it.
In ancient times, the Golden Thrones Chamber (described in The Secret Parchment) was used by the high priests. During the time of Burebista, one of the most famous kings of Dacia, a man named Deceneus was the high priest. He also served the equally famous Decebal who hid a legendary treasure from the Romans. It was Deceneus who made the connection with Zalmoxis in another reality. There are other portals to the other reality that exist not far from Sarmizegetusa and they all lead to the Valley of the Golden Thrones. The Golden Thrones Chamber is immune from electronic devices, including alien devices, because it exists in the consciousness of a being that uses its intention to open portals to it. It is only accessible if that being wants you to access it.
The following is taken from the abstract of the Amazon paperback version of the book.
A mysterious scientist by the name of David Anderson made an eventful trip to Romania in 1999. Dr. Anderson, who is credited by the U.S. government as having developed advanced time-warp field technology, established diplomatic connections on this trip to Romania where he also set up an advanced research facility dedicated to studying the mathematics of time travel. Upon his return to the United States, Dr. Anderson visited Preston Nichols and Peter Moon, internationally known authors of “The Montauk Project: Experiments in Time,” and introduced himself.
Dr. Anderson’s continued journeys to Romania eventually resulted in connecting Peter Moon with a Romanian publisher and Radu Cinamar, a member of the Romanian Intelligence Service’s occult department. The purpose of this collaboration has to do with what is arguably the most significant archaeological discovery in the history of Mankind: a mysterious holographic hall of records that utilizes technology far beyond the concepts of modern science. Transylvanian Sunrise is the story of this mysterious discovery and the political intrigue surrounding it, all capably told by Radu Cinamar.
However certain issues are noted with the claim of the characters mentioned in the fictitious story.
Radu Cinamar has been previously claimed to have risen to prominence for his role in exposing the most remarkable archaeological discovery in the history of Mankind: a secret chamber beneath the Romanian Sphinx containing holographic records of Earth’s history, bio-resonance imaging technology, and three mysterious tunnels leading to the deepest secrets of the Inner Earth per the book Transylvanian Moonrise: A Secret Initiation in the Mysterious Land of the Gods. However, Radu Cinamar is not noted in Wikipedia's list of notable archaeologists even though he has claimed to have exposed the most remarkable archaeological discovery.
Radu Cinamar is also claimed to be a member of the Romanian Intelligence Service’s occult department. However when one searches for the occult department of the Romanian Intelligence Service or Radu Cinamar in the claim, it did not return any results.
The mysterious profile of Dr David Lewis Anderson has been already analyzed by other skeptics in 2010, 2011 and 2012. The information that he was employed by the USAAF at Edwards air force base to do time research also cannot be proved by searching for the same in the Edwards air force website. His only awarded degree appears to be a BSEE from WV University in 1983. He also claimed in Coast to Coast AM, a North American late-night radio talk show to have worked with Lijun Wang (though he calls him "Julian") at Princeton University but Wang worked at NRC Research and there's no record of Anderson ever being there. However, David Anderson has USPTO (United States Patents and Trademark Office) receipt for a time travel system application submitted in 2009.