Final answer:
The positioning of all mosques must be oriented toward the city of Mecca, which is the direction (qibla) Muslims face during prayer. Mecca is significant in Islam as the birthplace of the Prophet Muhammad and the site of the Kaaba.
Step-by-step explanation:
All mosques, regardless of the period or country in which they were built, must be oriented toward the city of Mecca. This orientation is known as the qibla, which is the direction that Muslims face when performing their prayers. In every mosque, a mihrab, which is a niche in the wall, indicates the qibla and thereby the direction of Mecca. Mecca holds great significance in Islam as it is the birthplace of the Prophet Muhammad and the location of the Kaaba, the most sacred site in Islam. The mihrab and the qibla wall in a mosque are essential architectural features that help the faithful in orienting their prayers towards Mecca.