Highlights of Dubuque, Iowa
Dubuque, Iowa's oldest city, draws visitors with a lively and historical riverfront district along the mighty Mississippi.
Photo Courtesy of Digital Dubuque
Crystal Lake Cave
Miners discovered Crystal Lake Cave in 1868 after drilling 40 feet into the ground to look for a lead vein. Instead, they found a natural wonder. The cave, 3 miles south of Dubuque, is open May through October (563/556-6451; crystallakecave.com).