Bottom view of the iwan of the main entrance to the Jameh Mosque of Isfahan, Isfahan, Iran. The mosque, a UNESCO World Heritage site, is one of the oldest still standing buildings in Iran and it has been continuously changed its architecture since it was erected in 771 until the 20th century.

Bottom view of the iwan of the main entrance to the Jameh Mosque of Isfahan, Isfahan, Iran. The mosque, a UNESCO World Heritage site, is one of the oldest still standing buildings in Iran and it has been continuously changed its architecture since it was erected in 771 until the 20th century.. Learn more.