It is just off the side of US Rte 33, behind the guardrail.
The tunnel is tall--at least 15 feet tall, and wide, probably 20-30 feet. It divides just inside the entrance into at least two different tunnels. Water lays still on its floor. Ferns and other plants surround the entrance and a few hardier ones live within the cave.
When I took these pictures, there was no fog or mist visible. It was a clear, hot, sunny day. Yet each photo shows distinct mist rising from within the tunnels.
I would love to know more about this tunnel. Was it a railroad tunnel, a mine, a quarry?
If anyone knows, please share!