Bazeh Khur Fire Temple or four arches (Chartaqi), is one of the oldest samples of domed fire temples, believed to date back to Parthian era (247 BC – 224 AD). The temple is located 80km south of Mashhad, Khorasan Province, Iran at the edge of Robat Sefid village. In ancient Persian, Bazeh means mountain edge and Khur means Sun, then Bazeh Khur means where sun lights through mountain.
Recent studies show that except for religious purposes, four arches had astronomic usage; they were ancient observatories. The structure of the building from calendar point of view is so that at start and middle of each season, early sun rays when observed through columns, form a unique and precise configuration. This phenomenon makes the building a highly accurate solar calendar.

35° 46' 3.48" N 59° 22' 41.55" E