Trakai island castle is located on the Peninsula on a Peninsula formed by the lakes Onions and Galve. For the construction of the castle was chosen a place that is located in a remote place, located between the bogs and lakes. Trakai island castle was considered one of the most impregnable defensive fortresses from the 14th century in Lithuania, built in the times of the reign of Prince Kestutis. Castle building consisted of a Central castle m prejemke.

The castle was located on the territory of 4 hectares, and its exaltation took place immediately over the entire area once built przemoc and part of it adjacent to the hill. The most important is the role played by przemoc, which consisted of a large courtyard, where approaching enemies gathered all the troops and found refuge residents of the castle. Przemoc was enclosed by thick stone walls with five towers.

The front part of the castle consisted of a yard in the shape of a quadrilateral, which was surrounded by a defensive wall with different sized towers. In the tower façade to the city, were located the main gate Trakai castle. The most important was the South tower with buttresses. In the tower was full of loopholes, and the thickness of the walls was almost 4 meters. Judging by its architecture, size and location, it can be assumed that in the South tower could live the owner of the lock.

During the Crusades the enemies are heading to Vilnius, tried to avoid meetings with both garrisons Trakai castles that existed simultaneously for some time.

Throughout 1382 the Teutons at times devastated surrounding areas of Trakai. In 1383 enemies seized the castle, but could not long stand in defense. The crusaders brought to the castle walls bombards and devices for throwing stones. In the same year the castle was reclaimed by the Lithuanians, although it was badly damaged after numerous battles. In 1391 the castle together with the city were burned. Trakai island castle was destroyed not only the fault of the order, but also as a result of the fratricidal wars between the great princes of Latvia. Almost ruined buildings have often been the strengthening and restoration.

In the early 15th century ruined castle was fortified with another small adjoining walls and towers. It is known that wooden Trakai castle walls were replaced with stone in the 15th century. Thus, on the hill appeared a stone building, and to it was added a courtyard surrounded by walls. Near the foot of the hill was created by a moat, which reached 12 meters in width and fortified walls made of stone. In the process of execution of building works has been used the bricks, which in some places is completely concealed stone still the core of the walls. Trakai castle belonged to one of the largest castles of the time in all Lithuania. As for construction techniques, shapes and designs of the castle, they were almost indistinguishable from the locks of defensive architecture of the European model.

Time passed and Trakai castle ceased to be the reliable protection, because to him, it was easy to approach, and constantly developing military equipment was capable of destroying even the thick walls of the castle.

After the battle of Grunwald, a decision was made about the building of a fortress near the lake galvė. But the idea was never realized. Not completed and the construction of the Palace on the Sacrificial mountain. After Vytautas died, work was immediately stopped. Later, after the disastrous war with Russia in 1655 in 1661 locks stopped to recover completely. In the 18th century, the castle settled by Dominican monks. Soon they began building a Church, but they lacked funds, and in Neutrogena the Church there were a chapel and a monastery.

As soon as Lithuania lost its statehood and became part of tsarist Russia in 1795, not only the castle but also the Palace of the Vilnius lower castle were completely destroyed by the early 19th century. Approximately 4 hectares of the former castle grounds have been turned into a Park. Today, after a partial restoration, it often hosts city holidays.