
A castle 200km north of Tokyo was a battleground in Japan's last civil war in the mid-19th century - modern warfare did not bring it down. We look at the secrets to the its strengths and its lords.

A castle 200km north of Tokyo was a battleground in Japan's last civil war in the mid-19th century - modern warfare did not bring it down. We look at the secrets to the its strengths and its lords.

A castle 200km north of Tokyo was a battleground in Japan's last civil war in the mid-19th century - modern warfare did not bring it down. We look at the secrets to the its strengths and its lords.

A castle 200km north of Tokyo was a battleground in Japan's last civil war in the mid-19th century - modern warfare did not bring it down. We look at the secrets to the its strengths and its lords.

A castle 200km north of Tokyo was a battleground in Japan's last civil war in the mid-19th century - modern warfare did not bring it down. We look at the secrets to the its strengths and its lords.