Mehrangarh Fort is the best historical monument and one of the biggest fort of rajasthan.
This place is so well maintained and organised you cant miss a single room to see and yes you should definitely take a guide to understand it better, guides are easily available. Moti mahal, Phul mahal and excellent paintings will definitely catch your eyes and this is a perfect place to click beautiful photographs but you have to pay extra charges for camera.
The view from the top of the fort is amazing. This is an excellent fort with amazing architecture . If you ever have a trip to jodhpur it would be incomplete without visiting mehrangarh fort.