Wild blackberry (bramble) can be differentiated from poison ivy because it has thorns. The leaves in these pictures are a different shade of green too, but the leaves of each of these plants can vary in shade of green. However, the wild blackberry leaves look "dull," while poison ivy leaves look shiny. Also, this time of year wild blackberry plants have berries. If you look closely in the picture, the berries have already been "picked." I venture to guess the birds are enjoying them. I've tried to spray the poison ivy, but I guess I need to spray some more. This bunch here looks rather healthy.
Some people do react to Virginia creeper the same way others would react to poison ivy, so be cautious if you see this as well. Don't handle it unless you know whether or not you would react.
I wonder who is in here. There are quite a few of these holes in the ground under the trees near the wooded area. There are a lot of ground bees out there, but these holes look rather big for ground bees.
And, I wonder what kind of spider would build a web like this. The spider was hiding when I took the pictures.