The historical fort of Bhatner at Hanumangarh, Rajasthan in India was built around 1700years ago using burnt clay bricks with lime mortar. This fort complex has three gateway adorned with arches and tri-arch colonnaded spaces.These gateway structures are significantly distressed and several cracks on arches and vaults of gateway possibly are observed. The current paper presents a detailed geotechnical and structural investigation to find out the root cause of the distress in the fort. For geotechnical Investigation, the methodology followed for the geotechnical test comprises of appropriate sub- soil exploration including field investigation at 4 bore hole locations and relevant laboratory tests on soil samples for determining allowable bearing pressure of the soil. In structural investigation, settlement analysis has been performed on the 3D Finite element model of the fort considering gravity load and earth pressure on the fort wall using TNO DIANA software package. The study concludes that the distresses shown on the structure especially at Gateway 2 and 3 are due to soil settlement. Copyright © Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved.