Today, the western and northern sides of the hill are bordered by the residential districts of Khorramabad.

The height of the entire structure, including the hill, reaches to 40 meters above the surrounding area.

Archaeological studies have identified the existence of a two layered rampart with twelve towers around the present day construction.

From the twelve original towers, only two remain and these are situated northwest and southwest of the existing fortress.Falak ol-Aflak castle is made with different materials like stone and wood that are vulnerable to humidity.

That is why the castle was built on the highest point of the city of Khoram-abad, so that the wind could penetrate the building and dry its foundations.