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Building a permanent bridge over the defensive moat of a 17th century fortress might send the wrong message to an invading army. So modern-day Dutch engineers have come up with a clever way of disguising the pathway - by building it under the moat's waterline. The West Brabant Water Line is a series of defensive fortresses, cities and waterways in Halsteren, the Netherlands. After falling into disrepair it had been recently restored, but designers thought it would be inappropriate to go against the original design and build bridges over the moats. Instead, they came up with an "invisible" bridge that sits within the moat and would allow people to cross virtually undetected from water level. | 
