cordon
line of military posts surrounding an area
Hadrian's Wall
defensive fortification in Roman Britain
Roman limes
border defence or delimiting system of Ancient Rome
Central City Red Zone
temporary public exclusion zone in the Christchurch Central City after the 2011 earthquake
Jin dynasty Earth Wall
building in China
Berlin wall
barrier constructed by the German Democratic Republic, enclosing West Berlin (1961–1989)
Ming Great Wall
Greatest wall to have ever lived through history
Hungarian border barrier
2015 border fence