High Definition Range Imaging.

What is "HDR" according to Wikipedia?
High Definition Range is a set of techniques that allows a greater dynamic range of exposures (the range of values between light and dark areas) than normal digital imaging techniques. The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows.
And if done right, it looks something like this:
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Sample Sets:

High Definition Range:

Festival de Cannes 2005:

Europe:

Panorama:

Shanghai:

Xi'An:
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