Tour de Sauvabelin is a wooden observation tower in the Sauvabelin Forest above Lausanne. Built in 2003, 151 steps lead up to the observation platform at an altitude of 700m above sea level or 328m above the shore of Lake Geneva. It has a total weight of 130 tons and uses Douglas fir, spruce and larch from Lausanne's forests. The stairs are built using beams that are fixed on a central axis thus creating a double helix and separating the staircase leading up from the one descending.
It was designed by Julius Natterer from the IBOIS lab at EPFL.
Tour de Sauvabelin in winter
Tour de Sauvabelin in winter
 beams fixed on a central axis create a double helix staircase
beams fixed on a central axis create a double helix staircase
the 151 stairs leading up to the observation platform
the 151 stairs leading up to the observation platform
Tour de Sauvabelin
Tour de Sauvabelin
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