Iran, Isfahan, Niasar, Fire Temple

It is believed that the construction of this building dates back to Ardeshir I, founder of the Sassanid dynasty (reigned 226 – 241 );
Although the use of this building is not clear yet as some archaeologists consider it a "Fire Temple" while Mr.Moradi Ghias Abadi, an astro-archaeologist, suggests that with the help of this four arched building people in ancient times specified special days , such as solstices and equinoxes.