Ruinenberg
Potsdam, Germany · built 1748
The Ruinenberg is a hill in the Bornstedt borough of Potsdam, located north of Sanssouci Park. In 1748, the Prussian king Frederick the Great had a water tank with a capacity of around 7,600 cubic metres (270, 000 cu ft) built on top to supply the Sanssouci water features, and had it decorated with artificial ruins. From 1841 a surrounding landscape garden was laid out at the behest of King Frederick William IV of Prussia, according to plans designed by Peter Joseph Lenné.
Garden data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).