Mammoth Cave National Park is one of the most visited caves in the nation. Commemorate your visit to Mammoth Cave with this colorful, collectible hiking medallion. Hiking Medallions are increasingly popular in the United States and have been a long standing tradition in Europe. These medallions may be gently shaped to fit on hiking staffs, paddles, etc. Pre-drilling holes for the included nails is recommended to affix your medallion. They can also be flattened and glued to RV's and other flat surfaces.