Nicknamed U-jō (烏城; Crow Castle) because of its colour, the striking black Okayama Castle has an imposing exterior with gilded-fish gargoyles flipping their tails in the air. You can appreciate its impressive appearance for nix from either the grounds or across the river. In summer, the castle and nearby Kōraku-en are lit up and stay open late.
Inside the donjon (main keep), some modern finishes detract from the 16th-century feel, but there are a few interesting museum displays and views from the top floor. While it was first completed in 1597 under daimyō Ukita Hideie, much of the castle was dismantled after the Meiji Restoration and most of what remained burnt down during WWII air raids. It was rebuilt in 1966.
From Okayama Station, take the Higashi-yama tram to the Shiroshita stop, from where it's about 10 minutes on foot. Walking the entire way is also easy and takes about 25 minutes.