Unfortunately these ones are fenced off so you cannot explore them.
But you can get close to the fence & look at them. These ruins
are much more extensive than the ones my other cache is at and
that's probably why they are fenced off. It can probably be quite
dangerous rummaging around in them.
I found a place near these foundations that is just the right
size to hide a small preform in. The preform I hid is bright green
with a bright blue cap. I think it was supposed to have become a
Sprite bottle but it never did. Instead it has become a cache
container. Please conceal the cache as well as or better than you
found it or it probably won't last long.