Over time, the sand kept building up until it rose above the seas. The huge sand formations that rose out of the water are the tall sandstone cliffs you see today in the Wisconsin Dells. These unique cliffs can be found in only three other areas in the world, Switzerland, Germany and parts of New York. Some of the more distinctive rock formations are named for objects they resemble, such as Chimney Rock. During the 1800s, the Dells grew to be a popular tourist attraction in Wisconsin.
Visitors still enjoy exploring the area's caves and arches.