Buried Cities across the USA and other parts of the World

An unrecorded historical event evidently took place across the world prior to the 19th century. Some people call this event the mudflood. Some people even believe this could be the result of the Great Flood. There is evidence to show that the timeline could have been altered, meaning that most of us don't even know what year it actually is. Regardless, it is obvious that our history has definitely been falsified. These buried structures can be found all over North America and the world, yet no official explanation is given.