[1] Built some 2,000 to 6,000 years ago, it has four towers and stands 40 meters (130 ft) high and contained a plumbing system.

Peculiarly similar in design to Ali Qapu palace of Isfahan, it has a terrace high on top of the structure whose circulation is provided by two helical stairwells (whose walls have caved in, making it inaccessible).

The structure also has a large underground chamber (now filled by rubble), was possibly used as a prison.

Structures like Naryn Castle constituted the government stronghold in some of the older (pre-Islamic) towns of central Iran.

Some of these castles incorporate mud bricks of the Medes period and of the Achaemenid and Sassanid dynasties.