Sometimes called the Chalk Pyramids, the Monument Rocks are vast limestone formations that are believed to be part of the ocean floor eighty million years ago. It goes as high as 70 feet and are interestingly composed of fossils. Named as the first National Natural Landmark designated by the U.S. Department of the Interior in 1968, it was also dubbed as one of the ?Eight Wonders of Kansas? in January 29, 2008 together with Castle Rock. The Keyhole Arch is one of the most photographed parts of the Monument Rocks. This hole grows wider every year.

The Monument Rocks National Landmark is also the home of wildlife creatures. One of the most popular is the American Kestrel, which is known to be the smallest falcon which lives in the tiny holes along the rock formations. Pronghorns are native in the surrounding prairie area as well.