abandoned
architecture
army
bastion
battle
blockhouse
blown
bomb
building
bunker
casemate
concrete
czech
czech republic
czechia
czechoslovakia
damaged
defence
defense
europe
forest
fortification
fortified
historic
historical
history
infantry
invasion
landmark
landscape
military
monument
nature
old
pillbox
protection
sightseeing
snow
snowy
stronghold
underground
wall
war
warfare
wartime
winter
ww2