Dhat al-Hajj

Saudi Arabia

Dhodap

India

Dhosi Hill Fort

India

Diana Fortress

Serbia

Preserved ruins

Diaolou

China

Diaoyu Fortress

China

Didi Kond, Oshakan

Armenia

Didivan Castle

Azerbaijan

Didymoteicho Fortress

Greece

Ancient/Byzantine period

Diepenbeek Castle

Belgium

Diepenbroeck Castle

Belgium

Diepensteyn Castle

Belgium

Diesvelt Castle

Belgium

Dievčí Castle

Slovakia

Differdange Castle

Luxembourg

Dilbeek Castle

Belgium

Dinaburga Castle

Latvia

Excavated and exposed ruins

Dindigul Fort

India

Diocletian's Palace

Croatia

Diosig

Romania

Diu Fort

India

Div Castle

Iran

Diviacka Nová Ves Manor

Slovakia

Divín Castle

Slovakia

Diósgyőr Castle

Hungary

Djursholm Castle

Sweden

Office

Dobczyce Castle

Poland

Dobele Castle

Latvia

Impressive ruins

Dobor

Bosnia and Herzegovina

Dobra

Poland

Dobric

Romania

Dobromyl Castle

Ukraine

Dobrá Niva Castle

Slovakia

Dobrá Voda Castle

Slovakia

Doddendael Castle

the Netherlands

Dofteana

Romania