Steam Engine House

Built in the 1840s to supply water and irrigate the park, it even had enough money to build a fountain system. A 40-meter-high fountain shot out of the Havel River like a geyser. During the Cold War, the Berlin Wall ran directly next to the building. As a result, the building fell into disrepair in the border area, but today it can be visited again in good condition.

Steam Engine House for Sanssouci
The former steam engine house for Sanssouci – also called the "pump house" or "mosque" – is located in Potsdam on the Neustadt Havel Bay. It was built at the request of King Frederick William IV between 1841 and 1843 under the direction of Ludwig Persius to operate the Great Fountain in front of Sanssouci Palace. It is one of Germany's historic landmarks of engineering and represents an outstanding example of Orientalist architecture.
Text / Source: Wikipedia
de.wikipedia.org/wiki/Dampfmaschinenhaus_f%C3%BCr_Sanssouci

The steam engine house was built in the years 1843-1845 by Rudolf Gottgetreu according to plans by Ludwig Persius for the irrigation systems of the Park Babelsberg. The engine house is a two-storey, neo-Gothic brick building in the castle style with tin-cinnamon tower (the chimney) and Esse. In addition, a cavalier room was set up inside.