On the 60th anniversary of the start of the European Union, at least 3,500 demonstrators in Berlin joined an international protest to show their opposition to the UK leaving its member states behind. As British Prime Minister Theresa May prepares to trigger Article 50 next week, setting into motion negotiations for an EU without the UK, thousands in Berlin and other major cities took to the streets on Saturday, marking 60 years since the Treaties of Rome laid the foundations for the modern-day Union.