Summer is often thought of as the time of year to enjoy Wisconsin’s many natural resources. In the winter, visitors tend to flock to indoor activities in order to stay out of the cold. One Wisconsin landmark combines both nature and a comfortable indoor environment. No matter what the thermometer reads outside, it remains a steady 50 degrees inside the Cave of the Mounds.

Designated as a National Natural Landmark, Cave of the Mounds is located 20 minutes from Madison in Blue Mounds.

The cave was accidentally discovered in 1939 during a quarry blast. Word quickly spread about the discovery, which brought curious visitors with hopes of seeing the cave with their own eyes. Cave of the Mounds opened for tours in 1940.

The cave began formation more than one million years ago and continues to grow today. Visitors see the stalactites, stalagmites, columns and fossils on a one-hour guided tour through the cave.

A six-foot cephalopod fossil is also found on the ceiling of the cave. Highlights of the tour include spotting “cave bacon” and squeezing through what is known as the Narrows.

The underground cave is not the only activity found at this natural attraction. Hiking trails, gemstone mine, fossil dig and the Discovery Center offer outdoor activities for visitors. This area is worth another visit in the summer in order to view the prairie and savanna restoration gardens.

Cave of the Mounds also includes a snack bar and gift shop where geodes, fossils, gems and other rocks are available for purchase.

For more information on Cave of the Mounds visit www.caveofthemounds.com.