Chahar Padshahan - Credit: Wikimedia Commons
Chahar Padshahan (, "Four Kings") is the name of a historic mausoleum in Lahijan, Iran, where four rulers of the Karkiya dynasty are buried. It is number 322 on the list of national monuments of Iran. Despite being intended as a mausoleum, the Chahar Padshahan is also used as a mosque. Read more on Wikipedia
Source: en.wikipedia.org