The Einstein Tower (German: Einsteinturm), an astrophysical observatory in the Albert Einstein Science Park in Potsdam, built by Erich Mendelsohn, is built on the summit of the Potsdam Telegraphenberg to house a solar telescope designed by the astronomer Erwin Finlay-Freundlich.

The telescope supports experiments and observations to validate (or disprove) Albert Einstein's relativity theory.

The building was first conceived around 1917, built from 1919 to 1921 after a fund-raising drive, and becomes operational in 1924.

Although Einstein never works here, he supports the construction and operation of the telescope.

(It is still a working solar observatory today as part of the Leibniz Institute for Astrophysics Potsdam.)

Light from the telescope is directed down through the shaft to the basement where the instruments and laboratory are located.

There were more than half a dozen telescopes in the laboratory.

This is one of Mendelsohn's first major projects, completed when a young Richard Neutra is on his staff, and his best-known building.