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Iron Block Building - Credit: Wikimedia Commons
Iron Block Building - Credit: Wikimedia Commons
The Iron Block Building is a five-story commercial structure with a cast-iron exterior built in 1860 in Milwaukee, Wisconsin. In 1974 it was added to the National Register of Historic Places - the only surviving building in Milwaukee with a cast iron skin - a common technique from 1850 to 1870. Read more on Wikipedia
Source: en.wikipedia.org