Teufelsberg
Twelve euros full, five for under-18s and students, open every day from 11am until sunset with last admission an hour before; in January and February it closes on Mondays and Tuesdays. It is not an abandoned ruin you sneak into: it is a private site with a ticket desk, and the geodesic domes of the American listening station now hold one of the largest street-art galleries in Europe. The hill beneath is artificial, made of wartime rubble piled over a Nazi military college that was never finished.
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