old

concrete

fence

rings

barbed

wire

top

access

denied

protected

area

limited

restricted

prison

military

facility

wall

protection

security

border

danger

freedom

sky

sharp

metal

thorn

crime

steel

war

dangerous

private

boundary

barb

jail

forbidden

barrier

prohibited

evil

defense

punishment

guard

outside

concept

iron

zone

rusty

conflict

criminal

protect

safety

stop

lines

razor

background

closed

close

closeup

abstract