The museum began major renovations in 2014. The East Wing reopened in April 2017, featuring more interactive displays and replacing the model of the city with a new version that uses projection mapping to demonstrate the effects of the bomb blast.[2] When the East Wing reopened, the Main Hall was closed for seismic retrofitting until 25 April 2019.[3] The exhibits were also renovated during this time to focus more on victim's belongings, and are now divided into four sections: an introductory exhibit in the East Wing, "Reality of the Atomic Bombing" and a gallery in the Main Building, "Dangers of Nuclear Weapons" in the East Wing, and "Hiroshima History" in the East Wing.[4]