Mausoleum of Ala ud-Daula Simnani is located in the village of Sufi Abad (near Semnan), and is a remnant from the reign of Soltan Mohammad Khodabandeh dates back to the Ilkhanid era (1256-1353).
To the same, the Sheikh added the 'Khaneqah' or a kind of monastery, and continued to abstain from the world , and meditated in this site, ...