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Iran's rulers are considering plans to relocate the country's capital. They say Tehran is in danger of being struck by a major earthquake. So how easy is it to move a capital out of a city, and where might Iran's go? Penny Spiller reports.

Tehran is a sprawling metropolis at the foot of the Alborz mountain range. It is home to some 12 million people, and is the largest city in the Middle East.

Not only is it the political and economic heart of the country, the city has a cosmopolitan air with its museums, art galleries, parks and universities. It has been Iran's capital since 1795.

But now a powerful state body, the expediency council, has approved plans by Supreme Leader Ayatollah Ali Khamenei to end Tehran's days as a capital.