Many stories are spread regarding Yajooj and Majooj but only few of them are based on Quran and Sunnah, all other stories and details are opinions of some scholars while some others are lies spread by fools.
[junkie-alert style=”green”] In Quran Surah Kahf Allah tells us their story that how Dhul Qurnayn was asked by some tribes to make a barrier between them and the people of Yajooj Majooj who were responsible for destroying their property and agriculture. [/junkie-alert]
So Dhul Qurnayn used iron and melted copper to create a huge wall between them which stopped the tribe of Yajooj Majooj from disturbing others and creating mischief. But Dhul Qurnayn also said that when Allah want the wall be broken.
In a hadith Prophet (PBUH) revealed how near the end of the world and during the rule of Moosa (AS) this tribe will be able to escape from the wall.
There are many opinions where the wall is but the truth is neither Prophet Muhammad (PBUH) nor Allah told us the exact location.