英文關鍵字
abstract
architecture
bar
barred
barrier
bars
building
cage
castle
cells
close
closed
conceptual
convict
curtain
design
detail
detention
europe
exterior
float
frame
gate
grid
grill
grille
interior
iron
italy
liberty
metal
net
old
pattern
people
porto
portugal
prison
rough
safety
security
sky
steel
texture
torture
venice
wall
window
wrought