Paul,

Out of curiosity I tried the link you posted. One of the places mentioned,
Bay City, MI, I am quite familiar with. The description reads "Classic enclosure
with guard towers, high fence, and close to shipping port on Saginaw Bay,
which connects to Lake Huron. Could be a deportation point to overseas via St. Lawrence Seaway”.

The location given is the intersection of Columbus Ave and Washington Ave.
I drive by there about once a week and have never seen anything as in the
description. No guard towers and no high fence. It is about 5 miles from the Saginaw Bay though.

On the 4 corners of that intersection there is an ambulance garage, a bakery, a
neighborhood park and a tavern parking lot.