You couldn't simply take one trip to the Caspian Sea. It's so huge – it's larger than the whole of Germany – that it would take months to see its whole coastline. But head to the Azerbaijani capital of Baku and you'll get to see its shimmering shores beneath the futuristic skyscrapers.

From here you can take a boat tour to admire just a small portion of its vast shoreline.

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