Photo credit
In 1970, a devastating fire broke out on Fort Zverev that raged for several weeks.
When the fire finally subsided and the fort cooled down enough to enter, the basement was completely unrecognizable.
The inferno was so hot that it literally melted the bricks above which dripped down like stalactites.
In any normal household fire, even a very strong brick does not melt.
This requires a long enough temperature not less than 1,800 degrees centigrade.
For comparison, a large gasoline fire will produce temperature of about 1,100 degrees.
The truth will never be known.
At places the melted layer fell off, exposing the dead burned brick.Photo credit
Sources:boat.ucoz.ru/Dmitrij badyaev/Atlasobscura/Oddity Central
