Hi Kevin, a belated thanks for your reaction.
Nowadays many of the bunkers are clearly visible in the landscape but that is because the surrounding trenches and other obstacles have been removed over time. Some of them however, are still in their original surroundings, with trees and bushes for cover-up, which makes them more difficult to spot. In some instances they were camouflaged as farmhouses. But indeed, in a flat landscape they could quite easily be spotted.
Erik
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