Answer:
Use me if you really want to see inside someone
I am the only thing that place today before yesterday. (one word)
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
I am the building with the most number of stories. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.