Aussichtsturm Schlossberg
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The Aussichtsturm Schlossberg is a 35 metre high observation tower built of twisted trunks surrounding a metal structure with a spiral staircase. It is located on the Castle Mountain (Schlossberg) in Freiburg, Germany, which was built in 2002.
The tower is 30 m high and its top is 463 m above sea level, which is about 180 m above the city center below.