only means "worshiping place" and a worshiping place is not necessarily a temple; and on the other hand, if you want to say that the people worshiped in this place, it is not true, for the Ka'ba is so small that the compound within can not fit more than two persons. Furthermore, according to Herodotus (section "On the Customs of the Persians"), the Persians, even in his time, had no temples or statues of gods. Jacques Duchesne-Guillemin in Iranica identifies the ayadana as podiums. Additionally, in Achaemenid seals and on their mausoleums, it is seen that the fireboxes containing the royal fire were placed in the free space; and the royal fire was taken before the king in a portable firebox. A remarkable point that Herzfeld, Sami and Mary Boyce have made is that it seems improbable to have spent all that price and effort to keep the fire in a dark and holeless room that needed the door open for the fire to ignite. Because fire requires oxygen and the inside of the Ka'ba is built in a way that even an oil lamp can not glow more than a few hours when the door and the large stone entrance are sealed. The chamber does not have an exit way for smoke while its entrance door has always been sealed. The structure on the coins of Persian kings can not be Ka'ba-ye Zartosht; for the mentioned picture on the coins was not higher than , had a two-stair platform and no stairway is seen below its doorway; its entrance door is much larger relative to the structure than that of Ka'ba-ye Zartosht; its ceiling has no steepness, enough to be put three fireboxes on; there is no distance between its doorway and the ceiling; it has no crowns or portals; and the dents showing the heads of its arrows are not more than six. These features generally contradict with those of Ka'ba-ye Zartosht. Mausoleum Most of the researchers assume the tower as the mausoleum of one of the Achaemenid shahs. Since it is very similar to the Tomb of Cyrus and some of the mausoleums of Lycia and Caria in shape, solidness of architecture and having a small room with a very heavy door, it is considered a mausoleum. Welfram Klyse and David Stronach believe that the Achaemenid structures in Pasargadae and Naqsh-e Rustam might have been influenced by