ALGERIA A ISLAMIC COUNTRIE
Islam means submission to One God. Muslims worship God alone, the creator of all creations. Hajj is a pilgrimage to the city of Makkah (The birth place of Prophet Muhammad). The black structure is part of that Mosque in Makkah. It's hollow from inside. Muslims after they travel to the City of Madinah which is the burial place of Prophet Muhammad, they visit the grave of Prophet Muhammad which is inside the MASJID with a beautiful green dome.
They seek the blessings from Allah for this great worship, if it was done correctly and sincerely to Allah. Many of the acts of worship done by the Muslims in Makkah, are commemorating the doings of Prophet Abrahm who is the father of Prophet Ismail and Isaac. Isaac is the father of Prophet Jacob who is the father of Joseph. Prophet Muhammad's lineage goes back to Prophet Ismail the son of Ibrahim (Abraham) may peace and blessings be upon them all. They all were Prophets and Messengers of (God) Allah sent to teach the people the true religion, Islam. They all worshipped Allah alone. Islam is based on the belief that "There's no God but Allah and Abraham, Moses, Jesus and Muhammad are Prophets of Allah" and by saying this with belief one becomes a Muslim, a true believer.
The foundation of Islam is based upon five matters:
1. Professing and believing no one is God except Allah and Muhammad is the Messenger of Allah; (that includes the belief in all the previous Prophets like Jesus, Moses, and Abraham..)
2. Prayer; Praying to Allah 5 times a day. Prayers include words of praise and thankfulness to God the creator, giver, forgiver and merciful.
3. Zakah; Paying (for the able) once a year a small portion of charity to the poor and the needy people.
4. Fasting; Fasting the month of Ramadan, Obeying Allah in this deed and feeling with the poor and needy by abstaining from food or drink from dawn to dusk.
5. Hajj; Going to Mecca (for the able) to perform the Hajj (pilgrimage) praying to Allah, commemorating Prophet Abraham's deeds, praising and thanking Allah for the countless endowments he sent.