Ali Qapu is a grand palace in Isfahan. 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 48 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" which is "imperial" or "great" and Turkish "Qāpū" which is "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.