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In page Elkader, Iowa:

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The town is known for the Elkader Keystone Bridge over the Turkey River, said to be the largest stone arch bridge west of the Mississippi River. It, and many of the local buildings, are made from locally quarried sandstone. The town's grocery store, Wilke's, is the oldest continuously operated grocery store west of the Mississippi, as well.[citation needed] The city is also home to the renovated Victorian-era Elkader Opera House, and the Turkey River Mall, a 29-room hotel converted into antique stores.