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In page Cologne:

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The inner city of Cologne was largely destroyed during World War II. The reconstruction of the city followed the style of the 1950s, while respecting the old layout and naming of the streets. Thus, the city centre today is characterized by modern architecture, with a few interspersed pre-war buildings which were reconstructed due to their historical importance. Some buildings of the "Wiederaufbauzeit" (era of reconstruction), for example, the opera house by Wilhelm Riphahn, are nowadays regarded as classics of modern architecture.[citation needed] Nevertheless, the uncompromising style of the Cologne Opera house and other modern buildings has remained controversial.[citation needed]