The Golestan Palace (Persian: کاخ گلستان‎‎ – Kāx e Golestān) is the former royal Qajar complex in Iran‘s capital city, Tehran.

One of the oldest historic monuments in the city of Tehran, and of world heritage status, the Golestan Palace belongs to a group of royal buildings that were once enclosed within the mud-thatched walls of Tehran’s arg (“citadel”). It consists of gardens, royal buildings, and collections of Iranian crafts and European presents from the 18th and 19th centuries.

Also, read more at http://whc.unesco.org/en/list/1422