Alighapoo 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.
