One of the largest brick castles in the world, rising from a rocky hill in the centre of Khorramabad. The structure dates from the Sassanid period (3rd–7th century AD) though most of what stands today was built or rebuilt in later centuries. Eight circular towers frame the main structure; the walls are up to three metres thick in places.
From the battlements the view over the Khorramabad valley is dramatic — mountain ridges folding away in every direction, the river winding through the city below. The interior now houses an ethnographic museum focused on Lorestan province, with displays of Lur traditional costume, tools, and jewellery. Allow an hour to cover both the castle's architecture and the museum collections.