Clone Stamp Tool
The clone stamp tool takes a shot of a specific area of pixels, then pastes them in a different place. This tool is great for taking unwanted objects on the picture off, or put in a copy of the object. I used it on the picture of the Eiffel tower, and took out all the pedestrians and the cars and the like in the background. I believe that it turned out fairly well, though the building below the Eiffel tower was messed up a little bit.