Angela Merkel leads ceremonies to mark 20 years since collapse of Brandenburg Gate . Though dominated by nostalgia , Monday was also an opportunity to assess progress in a reunified Germany and democratized Eastern Europe , with many airing concerns that the world still has lessons to learn from the events of 1989 . 1,000 of people converged on symbolic Berlin Wall in center of Germany . Angela Merkel says Germany still has far to go in its unification process .
Angela Merkel leads ceremonies to mark 20 years since collapse of Brandenburg Gate . 1,000 of people converged on symbolic Berlin Wall in center of Germany . Angela Merkel says Germany still has far to go in its unification process .