Marienburgsky Castle, built by the Livonian Order, is in Aluksne district. From Marienburg Castle is almost nothing left. However, there is a legend about a clay pot filled with gold up to the top, which are stored in the cellars of the castle, or, or in the local vicinity. Ruins Marienburgskogo castle located on an island in the southern part of Lake Aluksne, and form an irregular hexagon. The island is still called Marijas. Castle Marienburgskim called because until 1917 the city was called Marienburg Aluksne in honor of the Virgin Mary.

From Marienburg castle on the peninsula Kapsetas passed the bridge length of 120 meters. Part of the bridge, where necessary, raised. The castle is 200 meters, width - 100 meters. The castle was surrounded by a fortified wall, the width of which was approximately 2-meters, and height - 10 meters. On the grounds of the castle were 8 towers that are located on the perimeter walls. Each tower has a diameter of 10-14 meters.

Marienburgsky Castle was founded in 1341 ordenmeysterom Livonian Burchard Dreylevenom. The fortress was built to protect Livonia against the raids of Russian troops. The castle is regularly subjected to assaults by the Russian, Polish and Swedish.

In 1658, the city of Marienburg was captured by Russian troops led by Athanasius Nasakin, and given to the ownership of Russia. However, after 4 years of Kardissky contract, he leaves Sweden. In 1702 the castle was again precipitated by Russian troops under the command of Count Sheremetev. Count ordered to conduct earthworks here for artillery unit. These bulk trees survived. Many do not even believe that they are part of the siege works, instead of the natural landscape.

Interestingly, the folk legend has it that the mountain of Russian soldiers dragged in their own caps. But why and for what purpose, history is silent. However, there is a version that Sheremetev, guided by the order of Peter I, was looking for buried here next to the castle Templar treasure. It is prohibited to use more severe means for raising the ground level. This was done to ensure that people were not able to hide the findings. So pour a mountain and called Temple Kalns. Translated from the Latvian language means "Temple Mount", but the name refers specifically to the Knights Templar. But in the annals of the smaller mountain that existed here before the arrival of the Crusaders, contained Latgalian wooden castle. According to another version it is known that the so-called mountain since 1807, when there was erected a monument - Temple of Glory soldiers (Russian and Swedes), who fought for the Marienburg.

In the XV century castle walls were thickened in some places up to two meters, especially under windows. It is believed that in these places the Knights Templar and hidden treasures. It is said that in 1702 was produced by the explosion of the castle, which allowed access to the gold, for which Peter I and brought the city of St. Petersburg.

The castle was blown up after a two-week siege. Swedish troops surrendered and left the castle with weapons and flags. But the two Swedish officers destroyed fortifications, blowing them, that they have not got Russian. Since Alūksne castle never recovered. Currently, in the ruins of the castle created an open air stage.