🔥 Archbald glacial pothole. NE PA. The world's largest. 42'x24' wide, 38' deep. Drilled by rushing glacial melt water and stones some 15,000 years ago. (I've got a secret, below).
What about it?
**this is actually the second largest glacial pothole. The largest is very nearby, but is entirely filled in. It was discovered by coal Miners.**