The castle of Trenčín dominates not only the city of Trenčín but also the whole of Považie region. It was built in the 11th century as a border fortress, guarding important fords of Váh river and the Carpathian ghauts through which trade routes passed. In the following centuries, it became the seat of the border district, then the royal and later aristocratic county.

Today, in its ancient premises, there are exhibition spaces and several expositions of the Trenčín Museum. The tour of the castle is a very interesting experience.

The Legend of Fatima and Omar is associated with the castle of Trenčín. The rumour says that the castle lord Stephen Zapolya captured the beautiful Turkish princess Fatima and the Turkish prince Omar, who loved Fatima was given the task of digging a well in the castle. For four years he had to dig into the rock to bring the water to the castle and then was released along with Fatima. The well is 80 m deep and is also known as the well of love.