Ribat of Sharaf - Credit: Wikimedia Commons
The Ribat of Sharaf () is a historical ribat, or rest place for travellers, located in Razavi Khorasan Province, Iran, between Merv and Nishapur. Built in the 12th century (circa 1114), the building looks like a fortified rectangle from the exterior. The courtyard and four-iwan floorplan is that of the traditional standard Iranian mosque. Read more on Wikipedia
Source: en.wikipedia.org