Skyline of Cologne, Germany -- Guenter Rossenbach/Corbis

Skyline of Cologne, Germany -- Guenter Rossenbach/Corbis

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• When it became a World Heritage Site, Unesco called this building an \"exceptional work of human creative genius”.""See what you think with more amazing pictures
• Construction began on this cathedral in 1248 and took nearly 600 years to complete.""And who said the Germans were efficient?
• More than 20,000 people visit Germany\s most popular landmark every day but it\s not the only thing to see here.""See what else this city has to offer
• A bridge here survived frequent bombing during WWII but was destroyed by the Germans themselves as the Allies entered the city.""It has since been replaced by this impressive structure