It is a marvel of engineering. India's Murud-Janjira fort stood in the sea unconquered for centuries. So, how was it built? And why was it so successful? This video from BBC News explains.
Can you build an unconquerable fort?

It is a marvel of engineering. India's Murud-Janjira fort stood in the sea unconquered for centuries. So, how was it built? And why was it so successful? This video from BBC News explains.
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