Should U.S. President Barack Obama opt to visit the Hiroshima Peace Memorial Museum later this week, Kenji Shiga, its director, is adamant that he wouldn't ask too much.

Shiga doesn't expect to hear the president renew his commitment to peace and nuclear nonproliferation. Nor would he demand an apology for the U.S. decision 71 years ago to drop an atomic bomb on his city.

All Shiga wants from Obama, he said, is for the president to feel what happened under the mushroom cloud that rose above the world's first atomic-bombed city on Aug. 6, 1945.