Tiny Fiction: Here, Before

I stopped abruptly, startled by the thumping of my heart. I looked. This place had the mark of something significant having had happened here. I had sensed these "marks" before, but this time it was much different. My breath caught in my throught. I had been here before and I had been here when the significant thing had happened! And yet, I had also, most assuredly, never been here in my life. How can this be?