After attending the Kabuki performance, I wanted to visit Yasukuni Shrine. It wasn't a long walk from the National Theater, but it was a hot day. The shrine and grounds were not crowded when I visited, probably because of the heat that day.
Yasukuni Shrine commemorates Japan's war dead. It was founded in 1869 with the purpose of enshrining those who died in war. Since 1978 fourteen class A war criminals are among the 2.5 million enshrined at Yasukuni. Official visits by several prime ministers and cabinet members makes the shrine a political controversy.
There is also a huge museum and cafe on the grounds. The museum entry fee is 1000 yen, and quite a bit of the information is in English, but photos are not allowed inside.