Mysterious City in My Minecraft World

I was going to download a city map for my own YouTube channel. I wish I hadn't done this. I took the city map from a random site and placed it in the world section. Everything was going as planned when I entered the world It started to get dark very quickly and it rained, I didn't care much but I saw strange people in every house. I randomly entered the red house and there was a bloody person sitting on the bed.My game crashed as soon as he looked at me gmail blade8724@gmail.com