Delavan's Vitrified Brick Street - Credit: Wikimedia Commons
A Vitrified Brick Street stretches across three blocks of Walworth Avenue and State Highway 11 in Delavan, Wisconsin. The entire street was built in 1913 at a cost of . Vitrified brick, formed from dense, and heavily fired clay, was used because it was water resistant and durable. The street would continue to be in use until 1996 when the roadbed was replaced. One third of the original bricks survived and continue to exist in the street today. It was added to the National Register of Historic Places in 1996. Read more on Wikipedia
Source: en.wikipedia.org