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Waterways and canal need locks to raise and lower boats between stretches of water of different levels. They can be small or huge, alone in the middle of nowhere or part of a series of locks in the middle of an urban environment. Show us images of a single lock or a series of lock, with or without boats or ships.
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Wednesday, 27th April, 2011 (GMT)
Wednesday, 4th May, 2011 – Tuesday, 10th May, 2011 (GMT)
Wednesday, 11th May, 2011 – Tuesday, 17th May, 2011 (GMT)
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