The Bibi-ka-Maqbara, or so-called 'poor man’s Taj Mahal', was built in 1679 as a mausoleum for Aurangzeb's wife, Rabia-ud-Daurani. Despite construction of this monument falling far short of Aurangzeb's expectations due to a lack of resources, the Bibi-ka-Maqbara is still one of India's most impressive Islamic monuments. Overlooking the Bibi-ka-Maqbara are the Aurangabad caves. Work on these Buddhist caves dates back to the fourth century, though it is thought that Cave 4, the oldest of the group, possibly dates back as far as the first century. The Aurangabad caves all contain fine carvings depicting various bodhisattvas and deities associated with the Buddhist following that flourished in this region until the sixth century.