Mashan observatory has tunnel to the underground observatory of the soldiers during the wartime. It is a good experience to actually go inside the tunnel to the observation area where you can view the China territory at the other side to the sea. If you are travelling alone, the entrance is hidden and you will not know that there is a tunnel to the observation post. I suggest to go inside but you might wait for someone else to go with you because inside the tunnel is creepy. Unless you are brave enough to go through. Its a good experience and see the tunnel design how it was constructed for survival during the war.
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