Ducal Castle

Italy

Ducové Hill-fort

Slovakia

Dudelange Castle

Luxembourg

Duino Castle

Italy

Duivenvoorde Castle

the Netherlands

Dulft Castle

Belgium

Dumbrăveni

Romania

Dumbrăvioara

Romania

Dunavățu de Jos

Romania

Dundaga Castle

Latvia

Preserved

Dundrum Castle

Ireland

Dundurn Castle

Canada

Dungannon Castle

Ireland

Dungiven Castle

Ireland

Dunham Castle

the United States

Dunluce Castle

Ireland

Dunmere

the United States

Dunseverick Castle

Ireland

Duras Castle

Belgium

Durgadi Fort

India

Durgam Fort

India

Durrës Castle

Albania

preserved

Dussen Castle

the Netherlands

Dutch Castle

Iran

Duurstede Castle

the Netherlands

Dvigrad

Croatia

Dybäck Castle

Sweden

Private residence

Dybów Castle

Poland

Dyngehus

Norway

Ruin

Działdowo Castle

Poland

Dzierzgoń Castle

Poland

Dzików Castle

Poland

Dédes Castle

Hungary

Döbrököz Castle

Hungary

Dønnes Manor

Norway

Dąbrowa Tarnowska Castle

Poland