15. The Meramec Caverns
Located in Stanton, Missouri, Meramec Caverns is a legendary Route 66 attraction renowned for its colorful billboards and spectacular show cave tours. For decades, it has drawn travelers eager to explore its underground wonders. Today, conservation efforts—highlighted by the National Caves Association—are focused on balancing tourism with the careful preservation of the caverns’ natural beauty and historical significance. These measures help protect both the cave’s delicate ecosystem and its place in roadside history.
