The building itself dates from the early 18th century but the real reason you come here is to see Islam in action. The courtyard is accessed from several parts of the bazaar and hundreds of people pass through here, so it’s usually possible for non-Muslims to stand and watch the faithful performing their ablutions and praying, though photography is less welcome.
Imam Mosque (historically known as Masjid-e Shah or the Royal Mosque), the construction of which began by Fath Ali Shah Qajar in about 1809 in line with his efforts to embellish the newly founded capital, was completed in 1849. It stands at the northern entrance to the bazaar not tar from the Golestan Palace.The Imam Khomeini Mosque of Tehran dating back to early 18th century but the real reason you come to visit Imam Khomeini mosque is to see Islam in action
Two side entrances of the mosque lead directly into the bazaar. The southern Ivan opens onto the prayer hall. The mosque has the usual four Ivans, on each of the four sides of a single-story arcaded court, decorated with early 19th-century haft rangui tiles. The turquoise and white dome of the sanctuary chamber beyond the south Ivan is crowned by a small gilded cupola seen here peeping over the Ivan. At the pool in the center of the court -a feature of nearly all mosques -the faithful perform their ritual ablutions before each prayer.
This mosque proves to be a great piece of architecture and beauty due its vast courtyard, beautiful Shabestans (or nocturnal areas), the giant tile worked dome and interesting arches and entrance