Peterhof is a series of palaces and gardens, laid out on the orders of Peter the Great, and sometimes called the "Russian Versailles". It is located close to St. Petersburg. The palace-ensemble is a UNESCO World Heritage Site. All of the fountains operate without the use of pumps. Water is supplied from natural springs and collects in reservoirs in the Upper Gardens. The elevation difference creates the pressure that drives most of the fountains of the Lower Gardens, including the Grand Cascade.

Sources, related links:
Wikipedia - Peterhof