Bicchu Matsuyama castle

You can only see it on a clear morning when there's a morning fog, between late Sept. thru early April, so if you can see it depends on how lucky you are. There's a taxi service that takes you to the observation point which leaves at either 7:30 or 8:00am from JR Bicchu Takahashi station, and you need to make reservations for it.

The website is in Japanese but you can use the Google translation. http://www.city.takahashi.okayama.jp/site/bichu-matsuyama/matsuyamajou-noriai-unkaitaxi.html