What the hell is the Nagasaki Torii Arch made of?

[WizardEQ]

Nagasaki after the A-bomb in 1945:

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Nagasaki after the earthquake of 2011:

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In 1945, there was a one-legged arch that remained standing. I'm not sure about these images, but it does signify the undying will of the human spirit.

[Japan]

granite