pillbox
concrete dug-in guard posts, normally equipped with loopholes through which to fire weapons
Mana Pillbox
fortification in guam
outpost
military post
Fort of San Francisco
fort in the Spanish city of Melilla
Pickett-Hamilton fort
type of hardened field fortification
Czechoslovak light fortification
concrete blockhouse system in Czechoslovakia
The Gatehouse at Bonds Mill
Grade II listed pillbox in Stonehouse, Stroud, Gloucestershire, England, UK