Free Derry Corner is a special place in Northern Ireland where people go to show that they want to be free from the British government.
A long time ago, Northern Ireland was part of the United Kingdom, a group of countries that belonged to the same government. But many people in Northern Ireland wanted to be their own country, and not part of the United Kingdom. They wanted to make their own rules, and live the way they wanted to.
In 1969, there was a big fight between the people in Northern Ireland who wanted to be independent, and the people who wanted to stay part of the United Kingdom. This fight was called "The Troubles." Free Derry Corner was a part of this fight.
One day, people in a neighborhood called Bogside in Derry, Northern Ireland, decided to make a big sign that said "You are now entering Free Derry." They hung the sign on the side of a building, and it became a symbol of their fight for independence.
For many years after that, people would come to Free Derry Corner to protest against the United Kingdom government. They would write messages on the walls, sing songs, or put up posters to show their support for independence.
Today, Free Derry Corner is a famous tourist attraction, and people from all over the world come to see it. It's a reminder of the struggles and fights people have gone through to be free and independent, and it's an important part of Northern Ireland's history.