In Rome a metallic geodesic dome (1928) is still visible in its structure. The first geodesic dome ever built, in Jena (1926), is not visible any more, therefore the roman one is probably the eldest existing geodesic dome. Both the one in Jena and that in Rome are metallic grids and were planned to support a (spherical) screen for a planetarium. To argue it deserves the attribute “geodesic” we performed a first onfield topological survey concerning the vertex degrees.
Carlini, A., TEDESCHINI LALLI, L. (2019). A metallic 1928 geodesic dome in Rome.. In D.R. Dagmar Szarková (a cura di), Aplimat 2019 (pp. 182-189).