TAKAHASHI, Okayama Prefecture--Bitchu Matsuyama Castle here is transformed into a dreamlike “castle in the sky” this season, as thick clouds appear to form natural walls around the fortress.

03:05 On the other side of the bridge is Okayama Castle, first built in 1597. 03:31 Zac has ridden westwards for 30 kilometers, and is now in the town of Kurashiki.

TAKAHASHI, Okayama Prefecture--A university lab is providing artificial intelligence-based probabilities on whether a sea of clouds will form around the “mountain castle in the sky” here.