Wanne observation tower is one of the oldest lattice towers in the world. It was built in 1888 by the observation tower cooperative on the 778m (2,552feet) Wanne mountain tub east of Villingen, in the Schwarzwald-Baar district in southern Baden-Württemberg, Germany. It was erected by bell foundry Grueninger of Villingen.The 30m (100feet) tower has three platforms and is remarkable for its uncommon design, as it has an octagonal cross section.