The Golden Age of Isfahan arrived in the 16th century under Shah Abbas the great .(1587–1629), who conquered it and made it the new capital of the Safavid dynasty. During the reign of Shah Abbas I, who unified Persia, Isfahan reached its pinnacle. Isfahan had parks, libraries and mosques that amazed Europeans.
Ali Qapu is located on the western side of the Naghshe Jahan Square opposite toSheikh Lotfolah 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 room, deep circular niches are found in the walls, having not only aesthetic value, but also acoustic.