In Ireland, some houses were built a long time ago to be very strong and safe. These houses were called fortified houses.
They were built with thick walls made of stones, so that it was very hard for anyone to try and break in. They also had high towers with little holes to look out of, so that the people inside could see anyone coming from far away.
Fortified houses were built because sometimes people would try to attack them or steal their things. By building these special houses, the people inside could feel safer and protect themselves better.
Nowadays, most people don't need fortified houses because the police and other people are there to protect us. But in the past, it was important for some people to have them so they could feel safe and sleep well at night.