I’d venture a guess that the ark of the covenant and the true cross are hidden in that black cube in mecca.
Islam and its satanic lapdog, Muhammad, have taken the Old Testament and corrupted it to serve his purpose, having taken the history of the Jews, its story, its folklore and co-opted it in a most malicious, sinister way. In the Bible, Abraham is told by God to sacrifice his son, Issac, to which he obediently pursues to carrying out.
That G-d Dam rock is the surface of which the Muzzlems claim Abraham was ordered to sacrifice his son, Ishmael.
My point is as the story of Abraham sacrificing his son, Ishamel is in fact merely a fairy tale concocted by Satan's Messinger to his own end, I don't doubt they would claim The Ark of the Covenant, the true cross as well as Jesus' chalice as the Holy Grail were all kept in the rock, as well.
To prove my point one of Islam's precepts is the belief that there will be a second coming of Christ. Not that he ever reigns, mind you, but merely that he would come again. And why is that? In his desperation to attract adherents to his newly formed cabal such as the Jews and Christians, he modeled Islam to accommodate the practices of the Jews in the forbidding of pork and praying East towards Jerusalem which was later changed to Mecca. As far as making Islam more appealing to Christians he concocted Islam's belief of Jesus return.
But that is as far as Muhammad, Islam goes, merely that Jesus returns. In the mosque built above the Jewish Temple in Jerusalem there is an inscription in Arabic that mocks Jesus as God's so-called son.