By the Decree of the Cabinet of Ministers of the Republic of Azerbaijan, it was included in the list of historical and cultural monuments of world importance.

[1] In 2001, together with other coastal defence facilities of the Caspian Sea, it was included in the UNESCO World Heritage Reserve List.

[2] The inscription (kitabe) on the castle's donjon says that it was built in 1232 by the architect Abdulmajid ibn Masud at the order of the Shirvanshah Fariburz III.

[8] The central tower of the castle is well distinguished by its cylindrical volume, that once, apparently, ended in a powerful battlement parapet based on preserved stone brackets.

[10] The limited number of loopholes and their design shows that the main defence of the tower was still concentrated on its upper platform.

[10] The lowest ledge protrudes slightly from the surface of the walls; its frontal plane is decorated with a geometric carved ornament.

[10] The Mardakan Castle's brackets are located frequently, which suggests a significant load and, consequently, a high parapet, probably crowned with battlements, hiding behind which, the defenders could fire at the enemy on the outskirts of the tower.