The headquarters of Libya's intelligence services - a notorious symbol of Muammar Gaddafis 42-year rule - is now firmly in rebel hands.
Detailed reports on anyone opposing him would come directly to this building. Parts of the compound also served as a prison, with secret cells housing many Libyans that the regime would make disappear.
The building is full of confidential documents that could provide a valuable insight into what was one of the world's most secretive regimes. But it will take weeks to sift through.
Jamal Elshayyal reports from Tripoli in this Al Jazeera exclusive.
Source: Al Jazeera