such as the Cross-Channel guns, were large naval guns housed in turrets. Some nations, from Albania to Switzerland and Austria, have embedded the turrets of obsolete tanks in concrete bunkers, while others have constructed or updated fortifications with modern artillery systems, such as the 1970s era Swedish coastal artillery battery on Landsort Island. Gallery See also Barbette Casemate Director (military) Gun carriage Gun mount Gun shield Rangefinder Remote weapon system Sponson Footnotes References Bibliography External links Air Gunnery November 1943 Popular Science article on aircraft turrets Flight article on aircraft gun turrets amongst others Lone Sentry's Bendix B-17 chin turret manual and details Weapon turrets Projectile weapons Fortification (architectural elements)