Okayama Castle (岡山城) has a beautiful light-up at night. It's starts at the sunset till mid night. From the other side of Asahikawa River, you can see beautiful reflection of the castle.

Tourist Info.
You can't enter Honmaru at night.

Access
0. at Okayama Station.
1. use on-street train to Shiroshita (5 min.)
2. walk east (5 min.)