(CNN) — Before their wedding ceremony begins in rural Afghanistan, a 40-year-old man sits to be photographed with his 11-year-old bride. The girl tells the photographer that she is sad to be engaged because she had hoped to become a teacher. Her favorite class was Dari, the local language, before she had to leave her studies to get married.

She is one of the 51 million child brides around the world today. And it’s not just Muslims; it happens across many cultures and regions.

Photographer Stephanie Sinclair has traveled the world taking pictures, like the one of the Afghan couple, to document the phenomenon. Christiane Amanpour spoke with Sinclair about a book which features her photographs called, “Questions without Answers: The World in Pictures by the Photographers of VII.”

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