Wide angle photography becomes most challenging one and also fun to the people seeing that photographs. off course it is challenging because it is very great to draw in so much of scene with a single shot and also it is very difficult to create a well composed photo at such a wide perception.
The wide-angle lens are used for this photography , This lens are refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane. This type of lens allows more of the scene to be included in the photograph, which is useful in architectural, interior and landscape photography where the photographer may not be able to move further from the scene to photograph it. Another use is where the photographer wishes to emphasis the difference in size or distance between objects in the foreground and the background.
You can get more information at Wikipedia
One of Canon's most popular wide-angle lenses – 17-40 mm f/4 L retro focus zoom lens.
YOU CAN SEE BELOW SOME OF THE EXAMPLES OF WIDE ANGLE PHOTOGRAPHY
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