What is "tohidkhaneh"

Tohidkhaneh is a historical building in Isfahan, Iran. The building is located behind the Ālī Qāpū palace. It was used as kitchen and prison of the palace for some time. It is said that it was the meeting place of Sufis in the Friday evenings in the era of Abbas I and they pray for the Shah in these meetings. It is also said that even the Shah attended himself in this circle.