pretty sure mudflood buildings are remnants of the antediluvian world Noah survived, and that the fall of Rome wasn't big enough to count for the End Times. The almost totalitarian rule of the Roman Catholic Church over all European royalty could never be mistaken for a millenial reign, because how could the evil papacy continue to rule during that?

besides, stone and brick artifaces submerged under thousands of miles of sea water, as long as Mt Everest is high, would probably squeeze the air out and distort them, giving the appearance of having been melted. Mold is as black as scorch marks.