Achitragarh Fort is the biggest piece of architecture during the fourth century. It was built by Nagavanshis with a splendid amalgamation of Rajput-Mughal architecture and holds very special status amongst India's heritage sites. It house three gates named as Sireh Pol (the outermost gate), Beech Ka Pol (a middle gate as per its name) and Kacheri. Several palaces have been located inside this fort. Hadi Rani Mahal, Deepak Mahal, Bhakt Singh Palace, Amar Singh Mahal, Akbari Mahal and Rani Mahal are the major palaces of this beautiful fort. There are two ancient temples in this fort named as the Krishna Mandir and the Ganesh Mandir and a Shah Jahani mosque within the fort complex.
It was built as a mud fort where one can see the battlements from all the parts of the city. Later on, it was rebuilt in stones by Mohammed Bahlim, the governor of Ghaznivites. The palace is a double storeys edifice which has Hadi Rani Palace inside it which is painted in the Abha work. There are appealing architectural features- protecting Jharokas, cusped bracket arches, wall paintings, mirror work.
The complete structure of the fort is spatial, very spaces are organized in this fort. There is juxtaposition of open, semi-open and enclosed spaces of the palace. With the boundary of this fort, there are two temples the Krishna mandir and the Ganesh mandir along with the Shah Jahani mosque is situated. There is a Jain temple in Nagaur which is beautifully carved out of glass and Jains. Besides it, Tarkeen Dargah is very popular Muslim shrine which is devoted to Hamiduddin Nagauri who was a disciple of the Khwaja of Ajmer. The Muslims and the Sufis consider this shrine as a very scared place.