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Like something out of a cold-war spy movie the Old Elbtunnel has an eery presence on Sundays when cars are not allowed through. Well worth seeing and a nice place to cool down on a hot day (not that it happens very often in Hamburg.)
A stroll around the different gardens here is a great way to clear your head in the middle of the city.
Also worth knowing is that it joins up to Alte Elbpark and this means that you can walk from downtown to the harbour through adjoining parks, arriving at Landungsbrucken with a great view over the harbour.