What do you see? The answer, posted on 27-01-2011 is at the end of the post
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Have you seen the pictures of the dry Niagara Falls?
Update 15/01/2011: most of you are right, this is a damaged fire hydrant. However, what is that black circle in the middle?
The answer 27/01/2011:as already stated this is a damaged fire hydrant. The black circle in the middle is a polycarbonate ball the prevents water from flowing out after the hydrant was damaged. When the hydrant is intactthere are steel holders which keep the ball lowered and allow water to flow. A schematic figure of the system, may be found here.