The following are photographs taken using very long photographic exposures. The first one is of the suspension bridge at Bristol and was taken by Justin Quinell using a pinhole camera with an exposure of six months. The streaks of light are the sun passing across the sky – at its lowest in the winter, and higher in the sky in summer.
The next, of the construction of the Museum of Modern Art (MOMA) New York, was taken by German photographer Michael Wesely with shutter exposures of nearly 3 years.
and here is another by Wesley is a year long exposure of an office.
via itchyi where there are more examples.