The very iconic Edinburgh castle, sitting on top of the hill above the city of Edinburgh. It is massive and impressive and served many purposes over the centuries that it existed. Some parts of it served as a prison, first during the war with Napoleon and also during the American revolution when the USA fought for independence from Great Britain. The captured Americans were not considered as prisoners of war but as rebels because there was no independent America yet! In the prison which is now a museum, an old American flag can be seen with 13 stars! History is so fascinating!