Gibraltar is a fabulous rock rising out of the Mediterranean and is identified in Greek Mythology as one of the pillars of Hercules. Its location gives it strategic significance, and has caused many scuffles over its possession.
Britain has hung onto Gibraltar since 1704, after beating Spain. Apparently Spain tried to take it back but in 1967 the inhabitants of Gibraltar voted 12,138 to 44 to remain under British rule.
Upset with the result, Spain completely closed the border and severed all communications for nearly twenty years. Later talks suggested joint sovereignty between Spain and the UK, but Gibraltar voters rejected that idea, this time by 17,900 votes to 187.
Gibraltar on Wikipedia