This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
cc public domain publicdomain photo border alley hall column architecture monochrome This is one of the three tunnels in Cockatoo Island all of which seem mostly pointless. The island is very small and is flat all around the edge so it seems lot easier to have just gone around rather than through the middle. The tunnels were built