Spiral Tower is concept for an observation tower ride powered by a windmill

A consortium of Dutch companies has developed a concept for a viewpoint, which would have electric cabins that would spiral up it and be run off solarpanels and wind.
Engineers KCI, electrical specialists Bosch Rexroth, steel experts Hillebrand and creative agency NorthernLight, are the four companies from the Netherlands that collaborated on the piece of conceptual architecture.
Its designers claim it will be the world's first "climate-neutral high-rise attraction".
A steel mast would be t