Doorways and Pulleys

It was a dull and rainy day in the centre of Bolton today and I was amazed when I spotted the back of this building.  I forgot to check the front to see what it's used for now but in a previous life it must have been used for warehousing or something similar judging by the large double doors on each floor and a pulley system still in place for hauling goods up.  I would have expected the doors and pulley system to have been removed long ago during renovations.  

For some reason I was really excited by this find and it only when I was looking at my photos later on that I actually noticed there's bits of green mouldy stuff and different coloured bricks framing the edges leading into the doorways, which just makes me like it even more!