Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
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 778-meter-high (2,552 ft) 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 30-meter-high (98 ft) tower has three platforms and is remarkable for its uncommon design, as it has an octagonal cross section.