Like its counterpart in Nikkō , this shrine inside Ueno-kōen was built in honour of Tokugawa Ieyasu, the warlord who unified Japan. Resplendent in gold leaf and ornate details, it dates from 1651 (though it recently underwent a touch-up). You can get a pretty good look from outside the gate, if you want to skip the admission fee.
In January and February there is a spectacular peony garden (joint admission ¥1000).