Strange New House

I've recently moved into a new house, this house was made in the year 1886, and was abandoned for the last 20 years. This house has a bizarre energy to it the first time I came to see the house my dog refused to come in or even near the house. I haven't seen or really heard anything abnormal yet, but I found something that really confuses me. While cleaning and remodeling the house I found pieces of metals and medallions on the doors, windows and other areas all through out the house.

This is the first time I'm living on my own and I don't want to be afraid of my house. So if someone could please tell my what these metal things are? Are they part of devil worshiping or what? Should I take them of or just leave them? Please help.