The Musjid serves as the focal point of any Muslim community and is the most important structure to Muslims.
Musjid of Amr ibn al-As radhiallahu anhu, Cairo, Egypt. Originally built in 642 CE, as the 
centre of the newly-founded capital of Egypt: Fustat. It was the first Musjid in Africa. The location for the Musjid was the site of the tent of the commander of the conquering army, Amr ibn al-As radhiallahu anhu. One corner of the Musjid contains the tomb of his son, Abdullah. Due to reconstruction over the centuries, nothing of the original remains, but the rebuilt Musjid is a prominent landmark in Cairo. The original layout was a simple rectangle 29m x 17m. It had columns made from palm tree trunks, stones and mud bricks, covered by a roof of wood and palm leaves. The floor was gravel. It was rebuilt in 673 by Muawiya radhiallahu anhu, who added 4 minarets.
Tooba Musjid, Karachi, Pakistan. Built in 1969 it is claimed to be the largest s
ingle dome Musjid in the world. It is built with white marble. The dome is 72m in diameter and is balanced on a low surrounding wall with no central pillars. It has a single minaret 70m high. The central prayer hall has a capacity of 5,000. A person speaking inside one end of the dome can be heard at the other end.King Saud Musjid, Jeddah, Saudi Arabia. Completed in 1987, it covers 9,700m² and is the
largest in Jeddah. The largest dome has a span of 20m and reaches a height of 42m. The minaret is 60m high. The layout reflects the Persian 4 Iwan designs, such as the Great Musjid of Esfahan, Iran.