Dyleň (German: Tillenberg) is a mountain in the Karlovy Vary Region of western Bohemia, located roughly 100 metres (330 ft) from the Czech Republic–Germany border. At 939 metres (3,081 ft) above sea level, its summit is the second highest peak in the Upper Palatinate Range (Bavarian–Bohemian Forest). Local tradition holds that Napoleon Bonaparte declared Tillenberg the geographical center of Europe in 1813. On its summit is a set of prominent buildings. These were used by the Soviet Union for electronic espionage into Germany during the Cold War.