Yes, because it is childish to ask for proof. A big, smart adult like you obviously believes everything without any evidence. Who cares if they find some pottery here and some tools there? You can just believe whatever you want to believe.
One of the charts by Gerhardus Mercator, the 16th century Flemish cartographer and geographer, shows a huge continent lying in the vicinity of the North Pole.
I know this map. It's based on account of some guy who tried to find the North West passage to India and claimed that he reached the North Pole. The trouble is that back then Europeans didn't know that the magnetic pole is not the same as the geographical pole. His Hyperborea is nothing more than some islands of the Canadian archipelago.