A Kiln shaped like an igloo is used for the production of charcoal since the 1930's. You can learn how charcoal is made here.
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Not fun for me
I joined the school trip to visit this place. The place smells weird, and you have to wear shoes if I was not wrong as slippers are not allowed. By the way, please wear clothes you won't mind dirtying because the charcoal particles will stick to your clothes. I went inside the igloo and that's the place where your clothes would get dirtiest.
The worker explained that the charcoal water will be exported to Japan as there is high demand due to its skin benefits. The girls went crazy and asked for the water which were given free. The water stinked and I didn't bother to ask for it as I did not have a bottle.