Khosro-Abad Mansion is the most beautiful one in the west of Iran; unfortunately, you can not find out about visiting time, it is said that on Thursdays and Fridays is open, but, that's not true (it's under restoration). Anyway, during Nowrooz (new year of Iranian) it's open for sure.
Residential palace (kind of palace) of Ardalan Dynasty (the dynasty ruled over Kurdistan for centuries, with some short intervals) is more than anything else associated with Khosro (Ardalan Ruler) and of course, Mastooreh Ardalan (the wife of Khosro, the poet, and the first female historian of Iran) whose statue is at the end of the boulevard in front of the building.
It used to be kind of Chahar Bagh (four gardens) with a ditch used to surround it; of course, new buildings around mansion have been built and so, it's not what it used to be. Still, you can see beauty, romance, poems (Khosro Ardalan the ruler and his wives were poets) and history there, anyway.
Like other Iranian mansions, it consists of some different sections; kitchen, internal area, external area, servants and monitors area and so on, but, moreover, a century back, some new parts have been built around the courtyard.
Now, there is a workshop where the most well-known sculptor of Kurdistan, Hadi Ziaedini works there and you can see some of his works. Almost, all of his works are about Kurds and Kurdish culture and you can find out more about them.