Mammoth Cave Historic Entrance — Outlier Feature
A structure at Mammoth Cave Historic Entrance · 🇺🇸 United States
The structure
About Mammoth Cave Historic Entrance — Outlier Feature
Outlier Feature at Mammoth Cave Historic Entrance – pictograph (Early Woodland to Historic (1000 BCE – 1812 CE mining)) – Longest cave system on Earth; prehistoric mining of gypsum 3