The Aussichtsturm Schlossberg is a 35 metre high observation tower consisting of wooden poles at angles surrounding a metal structure with a spiral staircase. It is located on the Castle Mountain (Schlossberg) in Freiburg, Germany. The tower 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.
http://en.structurae.de/structures/data/index.cfm?ID=s0028463