Wooden village
Träbyborg is located on Stora alvaret 700 meters north of Träby. The castle is one of the island's most unique castle facilities.
The castle consists of three connected ring castles. The inner diameters of the three ring castles vary between 44 and 66 meters. The walls are partially heavily demolished, the best preserved is the masonry in the middle building. The foundations of the houses, which are inside the walls, are barely distinguishable today. When Rhezelius visited the castle in 1634, they were still distinct and he could count 30 foundations in the north-eastern castle ring, 32 in the middle and 14 in the south-west. In the southwest castle are the ruins of a homestead, Christineborg, which was built in the early 1800s. A couple of hundred meters south-east of the castle is a burial ground with about ten visible round stones.