From afar, this densely layered rocks look like sedimentary rock, but a closer look reveals that it is actually granite. In the Ice Age, more than 100,000 years ago, this granite was covered by extensive glaciers, which caused compression from above. When the glaciers melted, this pressure was released, and the rock expanded slightly. The expansion process damaged the rock structure, leaving small horizontal fissures. Weathering completed the job and finally formations like this one, shaped like the wall of a fort appeared.