Lothurm, Wooden observation tower in Lamboing, Switzerland

The Lothurm was a wooden observation tower near Magglingen, in the municipality of Lamboing on the Plateau de Diesse. Its main structure consisted of debarked Douglas fir trunks, while the walkway and platform decking were made of black pine. The FSC-certified timber came from the Burgergemeinde Biel's Malewagwald forest and was left untreated, with no chemical weathering protection.

The structure was built between June and September 2003 as a memorial to the 1999 storm Lothar, which had felled millions of trees across Switzerland. The project was meant to symbolize forest renewal after this natural disaster.

The name Lothurm combines "Lothar", the 1999 storm, with "Turm", tower. Each step carried signs naming the firms and individuals who sponsored the construction, so climbing the tower meant passing the donors one by one.

The tower could be reached via paths from Lamboing village and offered views across the surrounding plateau and forest on clear days. Visitors would need sturdy shoes and time to climb the 99 steps to reach the viewing platform.

The wood came from the local municipal Malewagwald forest and was built without chemical treatments or protective coatings. This natural building approach allowed the structure to eventually return to the forest as it aged.