People of the Middle Ages did not know how to make concrete.
The ancient Romans had concrete, but the secret of how to make it may have been lost. So there was a time from the middle of the fifth century for about 1300 years when no concrete structures were built. Even if the secret had been recorded, the fact that no one was using it meant it was lost for all practical purposes.
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Fortified dwellings of the Middle Ages were castles and fortified manor houses. Not all dwellings were castles, however.
Cathedrals were built as testimonies to god's power on Earth.
There was no explorers in the middle ages. When exploration started that is when the middle ages ended.
Before the middle ages was Anquity (Greeks and Romans) and after the middle ages was the Renissance
because pheasant's houses had a roof made of a mixture of poo and other things while the rich people had proper houses