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The name Hathi Mahal seems to be have been given to it for its rather disproportionately massive pillars, looking like the legs of an elephant, supporting the high dome above. It seems that the building was originally constructed as a pleasure resort and later converted into a tomb, since a sepulchre is now seen inside and a mosque is also standing nearby, rather too close, thus spoiling its external architectural effect. It is planned like a baradari with three arched openings on each side. The dome has here, externally, a high octagonal base divided into bands of masonry molding which have thus imparted an unusual height to the dome. Source
Hathi Paga Mahal, literally meaning Elephant Leg Palace, (also referred as Hati Mahal). is a domed structure located on the south - eastern side of the Darya Khan Tomb Complex. The four massive pillars supporting the structure represents the elephant's leg and hence the name. It is crowned with a massive dome. It was probably built as a pleasure resort but later converted into a tomb. It contains the mortal remains of a unknown person and he is buried below the tomb. A flight of stairs leads to the underground crypt, but sadly the passageway have been blocked off. On the western side of the tomb is a small mosque crowned with three domes. A stairways leads to the mosque terrace offering great views of the surrounding, including the Darya Khan Tomb Complex. Source