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VItrified forts are ace.

Article - Local geology controlled the feasibility of vitrifying Iron Age buildings (No mention of dragons though which is a little disappointing)

https://www.nature.com/articles/srep40028

Sorry if this has been posted before.

Thanks fer that, funnily enough, I was thinking abut these forts the other day. I first became aware of them as a nipper cos of the Arthur C Carke prog 'Mysterious World...In fact, here's the short vid.....
Vitrified Scottish Forts from "Arthur C. Clarke's Mysterious World" (1980)
https://www.youtube.com/watch?v=jUb5212SCls

There's a brief overview similar, though less techy than the Nature article here....https://news.nationalgeographic.com/2016/03/160303-archaeology-history-forts-vitrification/

Visited a rare English vitrified fort the other week, although probably the result of either accident or attack: http://www.themodernantiquarian.com/site/1819/castle_hill_huddersfield.html