Determined to demonstrate that the bloc can survive the impending departure of the major power, EU leaders from 27 member states gathered at the Campidoglio Palace in Rome to celebrate the 60th birthday of the European Union's founding treaty on Saturday (March 25), without Britain. Renewing their commitment to what EU chief Claude Junker called an 'undivided and indivisible union' and promising a 'vision for the next ten years'.