The Zoroastrians consider the fire sacred. And they stand on fire while praying. And their sacred fire must not be extinguished. Most Zoroastrians in Iran live in Yazd. There is a Fire temple ( in Persian: Atashkadeh ) in the city that people have said has not been extinguished for more than five years.
On my trip to Yazd, I saw this fire and saw it from a window.
For non-Zoroastrian people, it is the view from behind the window, but Zoroastrians pray near that holy fire.
Best Regards
Rezgar