Tappe Mil (Persian: تپه میل or the Fire Temple of Rey Persian: آتشکده ری, Fire Temple of Bahram Persian: آتشکده بهرام) is one of the historical religious places in Rey, Iran which has stood since the Sasanian Empire.

It is named after Bahram V.[1] About 12 kilometers southeast of Ray city towards Varamin, on the top of a wide hill in the city of Ghalenou, there are the remains of a palace or fire temple, which is known as tappe mil "pillar Hill", and it is built on two big foundations, which looks like Mil from a distance.

Mil (Persian: میل) is a word in Persian language, which in architecture refers to a special narrow and tall building that was common in the past.

A part of the fire temple was destroyed during Alexander's attack on Iran, and only a part of the chahartaq "four-arched" and beautiful structure of this fire temple remained in the form of two pillars.

[3] For the first time in 1913, the French "Jacques de Morgan" restored this fire temple and the surrounding structures.