From the opening link:
https://www.autoblog.com/2021/01/19/austria-alps-motorcycle-museum-fire/#slide-2290027
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Built at 7,135 feet, at the border between Austria and Italy, the Top Mountain Crosspoint stood out as the highest museum in Europe. Several feet of snow couldn't prevent the flames from destroying the wooden building and most of the multi-million-dollar collection housed in it. What sparked the fire — which started at about 4 a.m. local time — remains under investigation. Footage of the blaze is embedded below.
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Fire protection systems (sprinklers) are designed to buy some time and this in turn will save lives, they are not intended to protect property. They are set up for a window of escape and to make rescue of human life by rescue teams unnecessary.
Timber construction is great because it takes a long time to burn though thick members and does not suffer from the decay of spray on fire protection coating clumping off of steel.
If it's not arson, that leaves electrical fire and lightning strikes. Being up top a mountain it could have been lightning.
10 things to know about thunderstorms that strike at night
https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=135631
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Anyone who has been stirred out of bed in the middle of the night after hearing thunder knows that intense storms occur frequently after the sun sets.
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When Lightning Strikes in the Mountains | Survival Guide
https://marvelmountain.com/blogs/blog/when-lightning-strikes-in-the-mountains-survival-guide
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In fact, lightning strikes are more common in mountains than in low lands.
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