The unfinished tomb of Ali Adil Shah II (d. 1672/1082 AH) was meant to be the greatest covered space in Bijarpur, but remains unfinished beyond the Gothic arches on the ground floor. It stands on a high plinth 65.5 meters square, with a central space of about 24 meters that was intended to be domed and contains 15 tombs. The square central space is surrounded by a double arcade of seven arches each. The tomb is dated in various sources from the 1650s through the sultan's death in 1672/1082 AH.
Sources:
Alfieri, Bianca Maria, and F. Borromeo. Islamic architecture of the Indian subcontinent. London, WC: Laurence King Pub, 2000.
Merklinger, Elizabeth Schotten. Indian Islamic architecture: the Deccan 1347-1686, 128. Warminster, England: Aris & Phillips, 1981.
Merklinger, Elizabeth Schotten. Sultanate architecture of pre-Mughal India, 145. New Delhi: Munshiram Manoharlal Publishers, 2005.
Michell, George, and Philip Davies. The Penguin guide to the monuments of India. Vol. 2, 435-436. London, England: Viking, 1989.