Des Moines
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This week's History Mystery is a postcard showing Walnut Street near 4th Street in downtown Des Moines.
Zoom in: The year was 1907 and Des Moines was in the middle of a population and development boom.
Zoom out: Also in 1907, Des Moines started building its iconic river bridges at Walnut, Locust, Court and Grand Avenue.
Congratulations to Axios Des Moines reader Neal Westin for correctly guessing the street!