What city was most sacred to moselums?

The city most sacred to Muslims is Mecca, located in present-day Saudi Arabia. It is the birthplace of the Prophet Muhammad and the site of the Kaaba, the holiest structure in Islam, located within the Masjid al-Haram. Muslims are required to face Mecca during their daily prayers and are obligated to perform the Hajj pilgrimage there at least once in their lifetime if they are able.