Here We Go!!
Don't be absurd, Nintendo would never copy Minecraft. No, this is someones fan build of Peach's castle from Super Mario 64 using the popular game Minecraft. Someone went and completely reconstructed the castle, including the surrounding area outside. These guys were serious Super Mario fans to dedicate the time to even making each individual room and location in the Castle. But I see they've admitted in the comments on Reddit to having a little help from an online map creator program... Hmmmmm.