The Ka'ba of Mecca and that of Naqš-e Rostam have several common features. Both have the dark rooms. The floors of them are on the protruded blocks of rock above the ground. The protrusions are the navels of the earth, i. e. the omphaloi.
The Iranian House of Origin and the Arabian First House were the centers of the universe from which creatures were produced.
There were a lot of monuments of the same principle as that of the Ka'ba in the Far East. They were also used as places of the rites de passage while people entered dark rooms of high floors and came out to get reanimated. The Emperor of Japan used to make the everyday toilet ceremony on the omphalos in his own palace.
