Italian president Sergio Mattarella (C, front), President of the Italian Senate Pietro Grasso(L, front) and President of the Italian Chamber of Deputies Laura Boldrini (R, front) attend the ceremony in the Italian Chamber of Deputies in Rome, Italy on March 22, 2017. Italian lawmakers gathered in the Chamber of Deputies on Wednesday to celebrate the forthcoming 60th anniversary of the Treaty of Rome, which triggered the whole integration process in 1957. (Xinhua/Jin Yu)