Where is Jesus' body?

I am not gnostic. I'm not even sure I know what it means, but I intend to find out. I read somewhere a few years ago, and it stuck with me, that gnostics somewhere have the remains of Jesus hidden somewhere. Does anyone know anything about this? I only read it somewhere that one time and haven't heard anything about it since. Also, if anyone could point me in the right direction to read about what gnosticism is, a clearcut definition, so to speak, and their beliefs, I'd appreciate it. It sounds fascinating.
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