Hungarian Prime Minister Peter Medgyessy (L) and Austrian Chancellor Wolfgang Schuessel (R) open the border from Hungary to Austria in Sopron Pusta May 1, 2004. Europeans celebrate to mark the unification of their continent on May 1 as former Warsaw Pact states join one-time Western foes in an expanded European Union of 450 million people. REUTERS/Leonhard Foeger LF/WS