Hi @Shubhu1 @SoniaK @KashifMisidia Bhai
The Daulatabad fort is located very close to my home in Aurangabad where I lived and spent the first 25 years of my life before moving to Pune in the year 2000. I have been to this fort at least 20 times in the past as part of school picnics, almost every year, along with friends and relatives for family outings.
About its history, I can claim to know more than any local tour guide 
Originally it was built by the Yadav dynasty in the 10-11 century as Devagiri Fort and was later conquered by Allauddin Khilji and renamed Daulatabad in the 14th century.
There were two rings of walls around the fort built one by the Yadav kings and later by the Khilji between which was situated the city of Daulatabad. The outer wall has vanished now.
Also, the most interesting thing about this fort was when Muhammad bin Tughluq shifted the capital of India from Delhi to Daulatabad in 1327.
He literally ordered everyone in Delhi including the cattle and everything to be shifted.
Soon he realized a lot of it was wasted or destroyed in travel, so he shifted back to Delhi and the remaining everything was destroyed in the return travel.
We are planning a huge meetup of Indian local guides in this fort in December this year.