"We salute the sacrifice of each and every Indian soldier martyred in the war," the Prime Minister said.
An official release quoted Modi as saying that the exhibition "brings alive the participation and bravery of Indian soldiers in various battlefields of this war across Europe, Africa and Asia".
The Prime Minister said he was touched to meet the descendants of some of the soldiers who were decorated for their service in World War I and urged youths to visit the exhibition to learn about the War, the release said.
It showcases the gallantry and sacrifice of Indian soldiers in the First World War. The army has also created a replica of a World War-I bunker displaying the living conditions of the soldiers then.
Chief of Army Staff Gen. Dalbir Singh, Navy Chief Admiral RK Dhowan and Air Chief Marshal Arup Raha were present during Modi's visit along with Defence Secretary RK Mathur.
The period between 2014 and 2018 is being commemorated as the WW-I centenary.