Gol Gumbad situated in Bijapur district of Karnataka is the second largest dome in the world. The Gol Gumbad is second in size only to St. Peter's Basilica, Rome. The Gol Gumbad is 124 feet in diameter. The architecture of Gol Gumbad is unique in the sense that the four minarets themselves are the staircases, leading to the top dome. Gol Gumbad is truly an amazing architectural wonder as the dome stands unsupported by pillars. The most fascinating and remarkable feature of the Gol Gumbad is its acoustical system. Even the faintest whisper around the dome echoes several times. The gallery around the dome of the Gol Gumbad provides a wonderful view of the town.
The most striking features of Gol Gumbad are the seven-storied octagonal spires at the four corners and the heavy bracketed cornice below the ramparts. The Gol Gumbad was built by Muhammad Adil Shah in the year 1656. Constructed at his orders before his death, the gigantic Gol Gumbad dominates the landscape of Bijapur for miles around. The Gol Gumbad or Gol Gumbaz has a floor area of 1700 sq., height of 51 m. and a diameter of 37 m. The walls of the mausoleum are 3 m. thick. The dome contains tombs of Muhammad Adil Shah, his two wives, his mistress, his daughter and grandson. The structure in front of the tomb has been converted in to a museum. Other prominent structures in the Gol Gumbad complex are a mosque, a Naqqar Khana, a gateway and a dharmashala.