Crusader Castles of the Teutonic Knights (2): The stone castles of Latvia and Estonia 1185–1560

Crusader Castles of the Teutonic Knights (1): The red-brick castles of Prussia 1230–1466

Crusader Castles of the Teutonic Knights (1): The red-brick castles of Prussia 1230–1466

Japanese Castles AD 250–1540

The Great Wall of China 221 BC–AD 1644

Chinese Walled Cities 221 BC– AD 1644

Chinese Walled Cities 221 BC– AD 1644

Mongol Warrior vs European Knight: Eastern Europe 1237–42