Fortress

North Macedonia

Fortress Kastel

Croatia

Fortress of Doboj

Bosnia and Herzegovina

Fortress of Faro

Portugal

Fortress of Komárno

Slovakia

Fortress of Poggio Imperiale

Italy

Fortress of San Leo

Italy

Fortress of Sant'Andrea

Italy

Fortress of Ukhaidir

Iraq

Fortunago

Italy

Forud Castle

Iran

Fosdinovo

Italy

Fossesholm

Norway

Fosteau Castle

Belgium

Fotodotis monastery-fortress

Greece

Byzantine period

Franc-Waret Castle

Belgium

Francavilla Fontana Castle

Italy

Frangokastello

Greece

Venetian period

Franklin Castle

the United States

Frankopan Castle

Croatia

Franzensburg

Austria

Frascarolo

Italy

Frasso Sabino

Italy

Frauenburg

Austria

Fredensborg Palace

Denmark

Frederick II Castle

Italy

Frederiksberg Palace

Denmark

Frederiksborg Palace

Denmark

French Fort Louis

India

Frijsenborg

Denmark

Fritzøehus

Norway

Frogner Manor

Norway

Frombork Castle

Poland

Front Castle

Italy

Fruithof Castle

Belgium

Frønningen

Norway