
Dyamasan / CC BY-SA 4.0
Nagasaki · Kyushu
Three towering 136m reinforced-concrete radio masts completed by the former Imperial Japanese Navy in 1922, standing on Hario Island between Sasebo and Omura bays. Designated a National Important Cultural Property, they are said to have relayed the coded signal that preceded the attack on Pearl Harbor.
Usual hours — confirm with the official site for holidays + seasonal closures.
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