At the west of Naghsh-e Jahan Square, just in front of the Sheikh Lotfollah mosque, one of the most magnificent palaces of 17th century is located. The Ali Qapu palace is well-known palace all over Iran. The first part of palace was built in 1597. It was used as a residential palace.  It is forty-eight meters high and there are six floors, each accessible by a difficult spiral staircase.