Ancient Clay

The 2,400-Year-Old Giant Clay Vase Discovered in Peru

Yeah, pretty sure that's not a vase. 
Also - not to doubt the archaeologists, I'm sure they thought of this - but a vessel this big, you'd build an ad-hoc kiln around it, which would be dismantled once the piece was fired; so the fact that there were no "remains of stoves" (LOL) doesn't seem conclusive, as to where it was fired. 

Anyway I thought it was an interesting story.