Display at the National World War II Museum in New Orleans, Louisiana, USA.
This display shows the number of casualties caused by the fire-bombing of Japanese cities during the latter stages of the war.
The text has the name of the city, the percentage of the population killed, and a representative city in the U.S. for comparative purposes (it really brings it home). Think of nearly HALF of Los Angeles being killed.
After going to the WWII Museum you will not think lightly about war again. You will also realize how far we have come in 50 years, that we can now bomb a single building instead of whole cities.
This realization then makes you realize how far we have to go.