"The Giant Dome, largest stalagmite thus far discovered. It is 16 feet in diameter and estimated to be 60 million years old.… https://www.rawpixel.com/image/8799733/photo-image-art-vintage-public-domainFree Image from public domain licenseU.S. Airmen with the U.S. Air Forces in Europe and Air Forces Africa rock band "Afterburner" perform for more than 60… https://www.rawpixel.com/image/8739402/photo-image-public-domain-person-childrenFree Image from public domain license