Skanderbeg's real name was Gjergj Kastrioti. He was famous for being a clever leader who used the mountains of Albania to protect his home region. He wasn't huge or super strong - what made him special was thinking carefully and moving quickly, like a chess player on a horse.
His helmet is one of the most recognisable in Europe - it has a goat's head with curling horns on top. You can see the real one (or a careful copy) in the museum at Kruja Castle, on a steep ridge above the town. Children in Albania learn his name as soon as they start school.
Albania has many other castles too. Gjirokastër Castle sits above a beautiful old town full of stone-roofed houses - it looks a bit like a wedding cake from a distance. Berat, another castle town, is called 'the town of a thousand windows' because so many white houses are stacked up the hillside that they look like one giant face full of eyes.
Today the castles are not used as fortresses any more. They are museums, viewpoints, or just places to picnic with a view. School trips often end with a class climbing up to one and looking out at the country from above. From the top of Berat's castle, you can see for kilometres in every direction.