Speight, Sarah

the United Kingdom

Spiere Castle

Belgium

Spinalonga Castle

Greece

Ancient/Venetian period

Spiš Castle

Slovakia

Spokenhof

Belgium

Spoleto

Italy

Spontin Castle

Belgium

Spring Castle

Azerbaijan

Sprogø

Denmark

Spruce Pine, North Carolina

the United States

Spycimierz

Poland

Spøttrup Castle

Denmark

Squillace, Calabria

Italy

Squire's Castle

the United States

Srebrenica

Bosnia and Herzegovina

Srebrenik Fortress

Bosnia and Herzegovina

Srochik Castle

Iraq

St. Angelo Fort

India

St. Anthony

Ghana

St. Augustine, Florida

the United States

St. Elizabeth Fortress

Ukraine

St. Jerome Fort of Daman

India

St. Nicholas Fortress

Croatia

St. Olaf's Castle

Finland

Largely restored

Stadtbredimus Castle

Luxembourg

Stalać Fortress

Serbia

Ruins

Stan Hywet

the United States

Stapelen Castle

the Netherlands

Staraya Ladoga Fortress

Russia

Stare Drawsko

Poland

Stare Selo

Ukraine

Starhrad

Slovakia

Stari Grad

Serbia

Under restoration

Stari Ras

Serbia

Preserved ruins(UNESCO World Heritage Site)

Starigrad Fortress (Fortica)

Croatia

Stary Dzierzgoń

Poland