Ali Qapu is a grand palace in Isfahan , Iran . It is located on the western side of the Naqsh e Jahan Square , opposite to Sheikh Lotfollah Mosque , and had been originally designed as a vast portal . It is forty-eight meters high and there are seven floors , each accessible by a difficult spiral staircase . In the sixth floor , Music Hall , deep circular niches are found in the walls , having not only aesthetic value , but also acoustic .
The name Ali Qapu , from Arabic "Ālī" (meaning "imperial" or "great") , and Turkic "Q?pū" (meaning "gate") , was given to this place as it was right at the entrance to the Safavid palaces which stretched from the Naqsh e Jahan Square to the Chahar Baq Boulevard . The building , another wonderful Safavid edifice , was built by decree of Shah Abbas I in the early seventeenth century . It was here that the great monarch used to entertain noble visitors , and foreign ambassadors . Shah Abbas , here for the first time , celebrated the Nowruz (Iranian New Year) of 1006 AH / 1597 C.E .
Ali Qapu is rich in naturalistic wall paintings by Reza Abbasi , the court painter of Shah Abbas I , and his pupils . There are floral , animal , and bird motifs in his works . The highly ornamented doors and windows of the palace have almost all been pillaged at times of social anarchy . Only one window on the third floor has escaped the ravages of time . Ali Qapu was repaired and restored substantially during the reign of Shah Sultan Hussein , the last Safavid ruler , but fell into a dreadful state of dilapidation again during the short reign of invading Afghans . Under the reign of Nasir ol Din Shah e Qajar (1848–96) , the Safavid cornices and floral tiles above the portal were replaced by tiles bearing inscriptions .
Shah Abbas II was enthusiastic about the embellishment and perfection of Ali Qapu . His chief contribution was given to the magnificent hall , the constructures on the third floor . The 18 columns of the hall are covered with mirrors and its ceiling is decorated with great paintings .
The chancellery was stationed on the first floor . On the sixth , the royal reception and banquets were held . The largest rooms are found on this floor . The stucco decoration of the banquet hall abounds in motif of various vessels and cups . The sixth floor was popularly called the Music Hall . Here various ensembles performed music and sang songs .
From the upper galleries , the Safavid ruler watched Chowgan (polo) , maneuvers and the horse-racing opposite the square of Naqsh e Jahan .
The palace is depicted on the reverse of the Iranian 20,000 rials banknote .