Kurobanejō is a Sengoku Period Mountain Castle and Edo Period Jin'ya ruin. It has sweeping earthworks, moats, trenches, gate complex ruins, and a reconstructed miyagura (watchtower). There are many impressive dorui (earth-piled ramparts) at Kurobanejō. Between the Honmaru (main bailey) and Umadashi sub-bailey is a deep trench, and the earthwork ramparts around the Honmaru are up to 50m high. Following the Ōtedō (castle's main road) and entering through the main gate ruin one passes a deep trench whilst ascending to the Honmaru flanked on both sides by tall dorui, a double-rampart configuration. The Honmaru is accessed by another gate complex after the trench, and here one finds a wide open space where the lord's palace used to be surrounded by high earthen ramparts. Along with the reconstructed watchtower, there is a Noh Stage here now. A museum to the poet Matsuo Banshō now stands in the castle's sannomaru (third bailey), and it is built with ishigaki (stone walls) beneath an elevated walkway to simulate a castle gate, but this, whilst nice, is not a historical structure. It is immediately adjacent to the Koguchi (Tiger's Maw) of the Umadashi (Horse's Flight) next to the Honmaru. The ninomaru (second bailey) is now the site of large modern structures with traditional flare. They're sort of like traditional architecture fused with brutalism. Objectively they are ugly, but one of them is clearly "castle-esque" in its design, although now it is abandoned. Mizubori (water moats) and tall dorui enclose an area where the Jin'ya building was subsequently erected, now covered in bamboo. In the area beneath the sannomaru bukeyashiki (samurai homes) existed, and this area is now a garden, but a gate there is a nod to the bushi residences that used to be. Sharing the castle mount is Daioji, a temple with thatched roof structures designated important cultural properties, which I recommend you don't overlook.