Ghahwareh Did (Gehbaneh Did) or Four-arched structure with has columns and a stone cone-shaped dome. Ghwarah Did is also known as Gehbaneh Div or Gahvareh Zeid.
This building was built in Deylamid period by Azud al-Dawla Deylami and is located on the top of the mountain, on the left side of Tang Allah Akbar ( Allah Akbar Gorge).
Its construction is similar to the architecture of Sassanid. It is a kind of tower.
This construction was the place for soldiers and observers and it was built on the top of the mountain to observe and report and transfer the urgent and important news to others so they used several signs such as: reflection of light with mirror, making fume, blowing horns and trumpets, and at night they used a fire to convey the news.
