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With his mirror of 10,4 metres of diameter, the Great Canary Telescope is now the biggest telescope of the world.

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How does that sound! A hotel in space! It is scheduled to greet visitors in 2012, who can wait?

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Take a whistle stop tour of some of the most spectacular radio telescopes in the world and find out about what actually goes on there. On almost all of the continents these giants command the landscape as they survey the skies.

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The sight of a dam – one of the largest and most complex structures that humanity has ever created – can be quite breath-taking. Take a look at some of the most spectacular of these structures.

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The rise of alternative energy in particular wind power in Spain.