"I am filled with hope and inspiration as I have the privilege to view this testament to Gandhi's life. He is a hero not just to India but to the world," Obama, who was struck with awe, wrote in the visitor's book at the Mani
Obama's wife Michelle, who was with him, wrote underneath: "This visit will be one that I will always treasure. The life and teachings of Gandhi must be shared with our children around the world."
The Obamas were greeted at the Mani Bhavan, the second halt at the start of their India tour, by its trustees.
The president also read the remarks written by American civil rights leader Martin Luther King, who visited Mani Bhavan in 1959.