Most of the city was destroyed during World War II. Next to the remnants of Gothic architecture the ruins of splendid edificies from the time of the Congress Poland and ferroconcrete relics of prewar bilding jutted out of the of rubble. After the war, large prefabricated housing projects were erected in Warsaw to address the housing shortage. The city resumed its role as the capital of Poland and the country's centre of political and economic life. Many of the historic streets, buildings, and churches were restored to their original form. In 1980, Warsaw's historic Old Town was inscribed onto UNESCO's World Heritage list. In 1995, the Warsaw Metro opened. With the entry of Poland into the European Union in 2004, Warsaw is currently experiencing the biggest economic boom of its history.