The Tower

The Grevenschlass, now known as Koerich Castle, was built by Wirich I, Lord of Koerich and Seneschal of Luxembourg at the end of the 12th and beginning of the 13th century in late Romanesque style. It was expanded in 1304 by Godefroid of Koerich who gave it a more Gothic appearance.

The keep, now 11 m tall, was certainly much higher when it was built. With a base measuring 12 by 11.6 m and walls up to 3.5 m thick, it is one of the most impressive in the entire region.
A spiral staircase inside one of the walls provided access to the different floors.

Standing on level ground in the valley of the stream of Goeblange, the castle's impressive keep and external walls blend harmoniously with the Baroque church and the old houses in the centre of the village.

https://en.wikipedia.org/wiki/Koerich_Castle