In this image, the Canon EF 8-15mm f/4 L USM Fisheye Lens' barrel distortion reduces the typical perspective distortion (converging lines) a rectilinear wide angle lens would deliver from the hand rails. The wooden floor boards, however, make it clear that a fisheye lens was behind this picture.
With an angle of view this wide, the sun frequently becomes part of the composition. I like to partially hide it behind something - the rope in this example.
Camera and Lens Settings
15mm f/11.0 1/250s ISO 100 5616 x 3744px