Ālī Qāpū (Persianعالی‌قاپو‎, from Ottoman Turkish Âli Qapı - "High Porte") is a grand palace in IsfahanIran. It is located on the western side of the Naqsh-e Jahan Square opposite to Sheikh lotf allah 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.

Cause of Denomination

The Ālī Qāpū has multiple connotations, but generally connotes entrance or supreme gate to the complex of palaces and public buildings of the Safavid Government.

Construction stages

The Ālī Qāpū building was founded in several stages, beginning from a building with a single gate, with entrance to the government building complex, and gradually developed, ending in the existing shape. The period of the development, with intervals lasted approximately seventy years.

First Stage : The initial building acting as entrance to the complex was in cubical shape and in two stories, with dimensions measuring 20 x 19 meter and 13 meter high.

Second Stage : Foundation of the upper hall, built on the entrance vestibule, with cubical shape, over the initial cubic shape structure with the same height in two visible stories.

Third Stage : Foundation of the fifth story, the music amphitheater or music hall, built on the lower hall, using the central room for sky light, and thus the vertical extension being emphasized.

Fourth Stage : Foundation of the eastern verandah or pavilion advancing towards the square, supported by the tower shaped building. By foundation of this verandah, the entrance vestibule was extended along the main gate and passage to the market, perpendicular to the eastern flank of the building.

Fifth Stage : Foundation of the wooden ceiling of the verandah, supported by 18 wooden columns, and contemporaneous with erection of the ceiling, an additional stairway of the southern flank was founded and was called the Kingly Stairway.

Sixth Stage : During this stage a water tower was built in the northern flank for provision of water for the copper pool of the columned verandah. Plaster decorations in reception story and music hall.

The room on the sixth floor is also decorated with plasterwork, representing pots and vessels and one is famous as the music and sound room. It is certainly well worth visiting for the cut out decorations round the room, which represent a considerable artistic feat. These cut out shapes were not placed there to act as cupboards: the stuccowork is most delicate and falls to pieces at the highest touch. So we conclude that it was placed in position in these rooms for ornament and decoration. The rooms were used for private parties and for the King's musicians, and these hollow places in the walls retained the echoes and produced the sounds of the singing and musical instruments clearly in all parts.

Decorations
The decoration of the large room on the third floor which opens out on the large pillared hall, and which was used by Shah Abbas for entertaining his official guests is the most interesting. Fortunately the ceilings, on which birds are depicted in their natural colors, have remained without interference in their original state from Safavid times, and these are the best roofs in the building.