He is joined by Mr. Jean Pierre Harrison, husband of Astronaut Kalpana Chawla - who perished in the Columbia tragedy - was present.
Astronaut Sunita Williams was also among those who were present on the occasion.
The Prime Minister had an interaction with think tanks which included the Brookings Institution, the Atlantic Council, and the Carnegie Endowment for International Peace, among others.
In an attempt to probe the minds of those who shape foreign policies, he interacted with the team and tweeted the same.
Prime Minister attended a ceremony for returning of the stolen artefacts to India, which will hopefully strengethen the ties between the nations.
"It is my hope and the hope of the American people that this repatriation will serve as a sign of our great respect for India's culture; our deep admiration for its people; and our sincere appreciation for the ties between our nations," US Attorney General Loretta E Lynch said at the ceremony.
A focus on heritage & culture...I thank the US government for the return of precious cultural artefacts to India. pic.twitter.com/9mxjtEU527
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Modi impact: US returns 200 artefacts worth $100 million to India; see what they are
PM Modi at Arlington Memorial, pays homage to Kalpana Chawala 
USA lays out red carpet for PM Modi