I follow an acct on Telegram that has an extensive amount of research on Tartaria and ancient history.
Here is one of her postings.
(I think Game of Thrones has a shit load of hidden secrets. The ice wall = Antarctica - Winter is Coming= the Pole Shift and plenty more)

You can see the North Pole continent in most old maps, along with Tartaria before it was removed in the 17th century.
In 2016, three pyramids were discovered in Antarctica. The pyramids measured over 1,220 meters (4,000 ft.) tall, making them about 10 times the height of the famous Great Pyramid of Giza in Egypt.
Antarctica was at the equator at the time, so living conditions were more tolerable. However soon after this discovery, the government has even blocked pictures of these pyramids on Google Earth.