Beelitz-Heilstätten, Potsdam-Mittelmark, Brandenburg

Nevertheless, the estate’s ruins have still garnered attention, featuring in Roman Polanski’s acclaimed holocaust drama The Pianist, while Tom Cruise shot scenes for Operation Valkyrie here.

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Today, treetop walkways crisscross the forest and arch over the Alpine House so tourists can see inside without entering the dangerously decrepit building – official tours are also available.

New life is slowly creeping back into the forlorn estate. New apartment blocks and homes have been built on the wider grounds, with more construction planned in the near future.