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There isn't much left to see, but with the help of a good imagination and artist impression, you can get an impression of what was once an important castle. Except for the well and a few rock walls, there are almost no parts of the buildings left, but the earthworks and moats are all visible. All signs are in Japanese and there are some photos from excavation work showing many details that have now been grown over. More interesting as a place to walk around in a forest than for historical or cultural reasons.
Minowa Castle was a "hirayama"-style castle located in the Misato neighborhood of the city of Takasaki, Gunma Prefecture, Japan. The ruins have been protected by the central government as a National Historic Site since 1987.
© OpenStreetMap contributors
達磨寺, shōrinzan daruma-ji
Famous for being the place where daruma dolls originated. The temple itself is nice, although nothing too special. The small museum of old daruma dolls beside the main temple is interesting.
榛名神社
A "power spot" built into the side of large rocks. It was established in 587.
観音山
This mountain and the enormous statue on top of it are the most obvious attractions. You can enter the statue for ¥200 to get a good view of the city from the top. Halfway down the mountain there is a cave with Kannon sculptures carved from the stone inside, along with a Japanese garden. Entrance ¥800. To get there, you can catch a bus from Takasaki Station, although they're infrequent, and it might be more interesting to walk up Kannon-dori and up the (long!) stairs to the top of the mountain.
榛名山, haruna-san
A large dormant volcano within Takasaki. By bus from the station it takes about an hour to reach the top. The shrine was founded in 586 and is very scenically located on the side of the mountain beside a river. Lake Haruna is a large crater lake a bit further up with various tourist facilities. It's possible to walk between the two, but the path is fairly long and poorly maintained. Buses come only every hour though, so it may be worth it.
If you are a huge fan of the Pocari Sweat sports beverage, and have some Japanese language ability, you can tour one of the facilities where it's made. Reservations need to be made between two weeks and two months ahead of time by calling the phone number listed, after which they send you an application form that needs to be filled out and returned.
群馬県立近代美術館, gunma-kenritsu kindai bijutsukan