Which city is considered the holiest city in Islam?

Mecca is recognized as the holiest city in Islam, primarily due to its significant historical and religious importance. It is the birthplace of the Prophet Muhammad and the site of the Kaaba, the most sacred structure in Islam, located within the Masjid al-Haram. Every year, millions of Muslims perform the Hajj pilgrimage to Mecca, which is one of the Five Pillars of Islam and mandatory for all Muslims who are physically and financially able to undertake the journey at least once in their lifetime. This central role in Islamic faith and practice, along with its deep religious heritage, firmly establishes Mecca as the focal point of devotion for Muslims around the world.