The Muslims do not worship at Mecca because something happened there. They worship at Mecca because the Black Stone or Kaaba is there. According to Muslims, Abraham used a black asteroid to create a place of worship for God and since the black asteroid is literally a stone from the heavens, it is seen as a closer connection to God.
Mecca is where the Kaaba is, and that is what Prophet Muhammad taught and how he prayed.
The House of Almighty Allah known as Ka'abah is the house of worship that Muslims believe that Abraham helped Ishmael build in Mecca.
Muslims do not worship any city. However, you may be asking which cities are holy for Muslims. The three most holy cities in Islam are Mecca, Medina, and Jerusalem.
The Western Wall in Jerusalem.
Mosque.
Muslims pray toward the Kaaba in the city of Mecca, located in Saudi Arabia. This act of facing the Kaaba during prayer is called "Qibla." It symbolizes the unity and uniformity of worship among Muslims worldwide.
Kaaba in Makkah (or Mecca) in Saudi Arabia
Mecca is a place in Saudi Arabia where many Muslims visit as a holy pilgrimage. It is said that God established this place with Abraham as the Ka'ba (the holy place) and all Muslims face in the direction of Mecca during prayer times.
Because, Before mecca to be the direction of worship, it was jerusalem's Masjide Aqsa towards which Muslims use to worship. Now throughout the world, every Muslim worship in the direction of Mecca. And second coming of Jesus is going to be in front of Masjide Aqsa (also known as baitul muqaddas) in Jerusalem.
People go to Mecca for different reasons including tourism. However, for the Muslims, this is an obligation to show solidarity and unity of their religion.
Muslims worship at mosques, which are scattered throughout the world in various cities and regions. The location of a mosque can vary depending on the community it serves, but they are typically found in urban areas where there is a concentration of Muslim residents.
Most Muslims worsip in a mosque facing the direction of Mecca. The muslims kneel to the holy book as the "Pope" (not sure what they call him) reads aloud. (actually I THINK this is what they do, just google search it to confirm!)