Explanation:

Gumbad is a square building topped with a circular drum over which rests a majestic dome, giving the building its nomenclature. It is built of dark grey basalt and decorated plaster work. The building has an amazing acoustical system. Along with the drum of the dome, there is a whispering gallery where sounds get magnified and echoed many times over. Gol Gumbad is a fine convergence of many styles located in medieval India.