Concrete was invented during the Roman period and was in large use by the Romans, the pre-ROman world did not use concrete including the Greeks because it was not know to them and it was not used in 6500BC because using stone when you have concrete makes not sense at all. So concrete was invented during the Roman period and was in large use by the Romans. Further on it was also not invented by British people in the 1800's.

Pizza was invented in Italy, Naples, it does not have roots in Greece or any other culture and does not have ancient roots, any similarities is an error in interpretation. Raffaele Esposito is credited with creating the first pizza in 1889. He made this pizza, known as the Margherita, for Queen Margherita of Savoy. The toppings of tomatoes, mozzarella, and basil represented the colors of the Italian flag, a nod to his country.

We often find attribution to ancient cultures things that never were made or invented by those ancient cultures, it is a symptom of wikipedia's unlimited sub-headings that strethces everything back to stome age people. It just doesn't go back that far and any similarities are not the same.