The Great Kanto Earthquake Memorial Museum was built in honour of the disastrous earthquake in Tokyo on September 1st 1923. Yokoamichio Park is now the site of many memorials to the lives lost during the earthquake including the Memorial Hall and the Great Kanto Earthquake Memorial Museum as well as to the victims of the air raids during WWII.
Entry to the Museum is free. The first floor explains about the earthquake and then has lots of photos of the damage that was done. Upstairs is a gallery filled with paintings that depict scenes from the earthquake as well as another section about the Tokyo Air Raids during WWII where once again many lives were lost to fire and much of Tokyo was destroyed. The entire tour in the museum takes around 20-30 minutes which is not long.