During World War II, bombs dropped over Tokyo wreaked havoc on the city. One of these air raids, known as Operation Meetinghouse (1945), is considered to be the most destructive bombing raid in history. Along with countless civilian casualties, many priceless historical monuments, temples, and shrines were lost during this time.
Source: https://www.discoverwalks.com/blog/tokyo/10-most-famous-historical-events-that-happened-in-japan/