Vienna is unique amongst world capitals in its consistent international importance over the centuries. From the ascent of the Habsburgs as Europe's leading dynasty to the Congress of Vienna, which reordered Europe in the wake of Napoleon's downfall, to bridge-building summits during the Cold War, Vienna has been the scene of key moments in world history. Scores of pivotal figures were influenced by their time in Vienna, including: Empress Maria Theresa, Count Metternich, Bertha von Suttner, Theodore Herzl, Gustav Mahler, Adolf Hitler, Josef Stalin, John F. Kennedy, and many others. In a city of great composers, artists, and thinkers, it is here that both the most positive and destructive ideas of recent history have developed. From its time as the capital of an imperial superpower, through war, dissolution, dictatorship to democracy Vienna has reinvented itself and its relevance to the rest of the world.