The Sun Palace is located in Kalat Naderi near the northeastern city of Mashhad, Iran.
The Sun Palace was built at the order of Nader Shah Afshar, the founder of the Afsharid dynasty, in 1729 CE.
Here are Tasnim News Agency’s photos of the historical Sun Palace- Ghasr-e Khorshid in Persian- in Kalat Naderi, northeastern Iran; near the holy city of Mashhad: