I discovered this location by searching through antique maps of suburban areas. Marking off several promising points of interest I set out. After finding several long gone, I came upon a winner. A tunnel system beneath one of Connecticut's tallest mountains. Portions of the mountain had been hollowed out long ago for the transportation of water to the then new communities outside of the cities.

Ater sevaral failed attempts to gain access to the tunnel system I finally managed to sneak in undetected late at night. The strenous 2 hour hike to the tunnel entrance had left me exhausted and worried that the tunnel would prove to be only a concrete shaft.

I entered the largest tunnel which was big enough for me to stand up in. The first hundred yards of tunnel was simply the concrete tube that concerned me, but soon I saw something odd in the distance, at the edge of flashlight's glow.

The tunnel abruptly transformed from concrete into rough hewn stone. I was deep within the heart of the mountain. Thousands of tons of stone pressed down on all sides here and water leaked from the roof in multiple places. As I journeyed farther down this man-made cave system I found the ancient remenants of its construction; shovel handles, collapsing benches, and great chambers. All this hidden deep inside a mountain that is off limits to the public.

Update:

This photo was taken during the construction of the tunnel.