The first geodesic dome was built in 1922 on the roof of Carl Zeiss Jena workshops, Germany. Walter Bauersfeld left the icosahedron subdivided according to 16 frequency. The structure consists of 3480 bars and was covered with ferrocement, inside a planetarium known as "the wonder of Jena" was developed. They quickly built more of these planetariums, opening in 1930 the first in the US in Chicago.
