Vienna summary

Congress of Vienna, assembly in 1814–15 that reorganized Europe after the Napoleonic Wars. It began in September 1814, five months after Napoleon I’s first abdication and completed its “Final Act” in June 1815, shortly before the Waterloo campaign and the final defeat of Napoleon. The settlement

Danube River, river, the second longest in Europe after the Volga. It rises in the Black Forest mountains of western Germany and flows for some 1,770 miles (2,850 km) to its mouth on the Black Sea. Along its course it passes through 10 countries: Germany, Austria, Slovakia, Hungary, Croatia,

OPEC, multinational organization that was established to coordinate the petroleum policies of its members and to provide member states with technical and economic aid. OPEC was established at a conference held in Baghdad September 10–14, 1960, and was formally constituted in January 1961 by five

World Heritage site, any of various areas or objects inscribed on the United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage List. The sites are designated as having “outstanding universal value” under the Convention Concerning the Protection of the World Cultural