The traditional Torii entrance gates to Shinto shrines (representing the spiritual connection between the people and the land) were among the very few structures to survive in Hiroshima in 1945 after the U.S dropping of an atomic bomb during the Second World War and in the Japanese village of Otsuchi after the earthquake and tsunami in  2011.

Nagasaki after the atomic bomb in 1945

2011 after the earthquake and tsunami

I have a question for you: What are the Torii entrance gates made of?