The Rock of Gibraltar defence guns of world war two.
They are apparently ineffective against seagulls.
Rock of Gibraltar World War Two Defence Guns - Page 3 1. Rock of Gibraltar 2. Apes 3. Gibraltar Guns 4. North Africa 5. WW2 Guns 6. Naval Guns 7. Gun Battery 8. Inside defence gun 9. Pillars of Hercules 10. Cable Car 11. Tunnel System