Zurich in Switzerland as seen from the top of the viewing tower on Mt Uitleberg. It's a very wide angle lens used for landscape photography. Even though you don't see it in a regular camera because it's slight,
all camera lenses distort images. A wide angle lens pushes this even further to get more into the shot and fisheye lenses are at the extreme where they can see a full 180 degrees to your left and right.