The architecture can be found in a vast area stretching from the Hindu Kush to eastern Anatolia. Also from Central Asia to the Persian Gulf. The homeland of Seljuk architecture was Turkmenistan and Iran. This is where the first permanent Seljuk buildings were built. Unfortunately the Mongol invasions destroyed most of these buildings. Only a few remain. In 1063 Isfahan was established as capital of the Great Seljuk Empire under Alp Arslan.