The palace-park ensemble of Gatchina had arisen in 60th years of a XVIII-th century. The centre of ensemble is the palace erected in 1766-1781 under the project of architect A.Rinaldi for the favourite of empress Catherine II Grigory Orlov. In 1783 Gatchina became residence of the successor of the Russian throne, the grand duke Pavel Petrovich, the future Russian Emperor Pavel I. About palaces and parks, their stories and architectural advantages are told by a memorial estate site. Besides, here the information on collections of a museum and offered programs-excursions, the literature on Gatchina, materials of conferences is presented, to news, etc.