A Tripoli citizen walks along the wall painted with graffiti depicting the 2011 war that toppled Libya's former leader Muammar Gaddafi in Tripoli, Libya, on Oct. 20, 2014. Libya marks on Monday the third anniversary of the death of Gaddafi, captured and killed by rebels in his hometown of Sirte after an eight-month revolt against his four-decade rule backed by NATO air strikes. [Photo/Xinhua]