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Olavinlinna Castle or Olofsborg in Swedish, is a fortress and also castle building founded by Erik Axelsson Tott in 1475. The building, also known as St. Olaf’s Castle, located at Savonlinna, Finland.

Doge’s Palace, also known as Palazzo Ducale di Venezia, is a palace constructed from 1309 to 1324 at Venice, Italy. The exact architect is unknown, but it perhaps designed by Filippo Calendario.

The Alcázar of Segovia, or Segovia Castle in english, located in the old city of Segovia, Spain, exactly on a rocky crag above the confluence of the rivers Eresma and Clamores near the Guadarrama mountains. The building is one of the most popular historical sights in Spain built in 1120.