Power at Sea fountain (Die Macht zur See) with marble figures encircling a ship, created by Rudolf Weyr in 1897, Hofburg, Vienna, Austria, Europe

Sculpture and fountain Power at Sea (Macht Zur See) by Rudolf Weyr, Hofburg, Vienna, Austria, Europe

Entry gate with sign Arbeit Macht Frei (work makes you free), Auschwitz Concentration Camp, UNESCO World Heritage Site, Oswiecim, near Krakow (Cracow), Poland, Europe

Entry gate with sign Arbeit Macht Frei (work makes you free), Auschwitz Concentration Camp, UNESCO World Heritage Site, Oswiecim, near Krakow (Cracow), Poland, Europe

Entrance gate with lettering Arbeit macht frei, Auschwitz Concentration Camp, UNESCO World Heritage Site, Makopolska, Poland, Europe

Entry gate with sign Arbeit Macht Frei (work makes you free), Auschwitz Concentration Camp, UNESCO World Heritage Site, Oswiecim, near Krakow (Cracow), Poland, Europe

Peter the Great room, or small throne room, in the Hermitage in the Winter Palace, Saint Petersburg, Russia

Catherine Palace in Tsarskoye Selo, 25 km south-east of St. Petersburg, Russia

Catherine Palace in Tsarskoye Selo, 25 km south east of St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

The Armorial hall in the Hermitage in the Winter Palace, Saint Petersburg, Russia

Vodovzvodnaya tower, in the foreground, Iwan the Great belltower, middle and Cathedral of St Michael the Archangel, middle right, Moscow, Russia

East chapel in the park of Peterhof Palace, St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Samson fountain in the park of Peterhof Palace, St. Petersburg, Russia

Catherine Palace in Tsarskoye Selo, 25 km south-east of St. Petersburg, Russia

Kreml with its building (from left): Grand The Kremlin palace and its buildings (from left): Cathedral of the Annunciation, Iwan the Great belltower, Cathedral of the Archangel Michael and the Saviourtower (Spasskaya) of the Kremlin wall, Moscow, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Grand Cascade in Peterhof Palace, St. Petersburg, Russia

Catherine Palace in Tsarskoye Selo, 25 km south east of St. Petersburg, Russia

Dachau Concentration Camp Memorial Site, Bavaria, Germany, Europe

Main gate with the 'Arbeit macht frei' slogan over it, Auschwitz Concentration Camp, Oswiecim, Malopolska, Poland

Main gate with the 'Arbeit macht frei' slogan over it, Auschwitz Concentration Camp, Oswiecim, Malopolska, Poland

Poland, Auschwitz-Birkenau State Museum, Auschwicz Concentration Camp, 'Arbeit Macht Frei' slogan above the entrance gate.