Mecca is a city in Saudi Arabia and the holiest site in Islam.
What makes Mecca so holy? The Kaba. The Kaba is a shrine over the biblical site where Adam created the first temple for God. The Kaba is symbolic of human’s relationship to God. In addition, the prophet Muhammad was born in Mecca.
Muslims face Mecca whenever they pray.
http://www.britannica.com/place/Mecca
Gulevich, Tanya. Understanding Islam and Muslim Traditions: An Introduction to the Religious Practices, Celebrations, Festivals, Observances, Beliefs, Folklore, Customs, and Calendar System of the World’s Muslim Communities, including an Overview of Islamic History and Geography . Detroit, MI: Omnigraphics, 2004. Print.
To read Understanding Islam and Muslim Traditions, please see attached document.