This document provides details about the Quba Mosque located in Madinah, Saudi Arabia. It describes the mosque's affiliation with Islam, its structure including 6 domes and 4 minarets, and its capacity of 20,000 worshippers. The mosque was the first ever built and its first stones were laid by the Prophet Muhammad and his companions. Throughout history it has been renovated and expanded by various caliphs and rulers. Today it remains an important pilgrimage site for Muslims.