My favourite example of "what the heck happened here" being vitrified forts - someone had gone to the bother of melting the walls of fairly substantial fortress

My favourite example of "what the heck happened here" being vitrified forts - someone had gone to the bother of melting the walls of fairly substantial fortresses - nobody has a clue whether this was intentional or accidental: https://en.wikipedia.org/wiki/Vitrified_fort https://en.wikipedia.org/wiki/Vitrified_fort