Hoshang Shah's Tomb
Mandav Architecture.

Mandu or Mandavgad is an ancient city in the present-day Mandav area of the Dhar district. It is located in the Malwa region of western Madhya Pradesh, India, at 35 km from Dhar city. In the 11th century, Mandu was the sub division of the Tarangagadh or Taranga kingdom. This fortress town on a rocky outcrop about 100 km (62 mi) from Indore is celebrated for its architecture.
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Source : Wikipedia
Basically it's a mix of Islamic and Hindu Architecture.

This tomb is a marble construction in honor of Hoshang Shah who holds a significant position in the history of India. It is noted that the tomb was constructed in the 15th century. The tomb was so beautiful that it impressed Shah Jehan and so he sent four of his architect before construction of Taj Mahal. It has been said that Ustad Hamid had a great association with the team who constructed Taj Mahal.
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Hoshang Shah (Alp Khan) (1406-35) was the first formally appointed Islamic king of the Malwa region of Central India. Also called Hushang Shah Gori, he was known as Alp Khan before he took on the title Hoshang Shah after being crowned the ruler of Malwa. Thus he had practically come to Mandu in 1401 as the first King of Malwa, although he did not declare himself a king.
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Source : Wikipedia, IndianHoliday.com