Stirling Castle once was a Royal residence of the kings of Scotland. Being situated near the border to England, the castle was of strategic importance for centuries before it became the seat of kings. When the Scots started to convert it into a Royal residence, the builders included a curious code into the ceiling of the king’s bedchamber. The code was cracked to reveal the music hidden within.
The Principality of Liechtenstein is sandwiched between Austria and Switzerland. It is a hereditary principality with political powers shared equally between the elected parliament and the prince. Nobody knows what happens if ever they should agree to disagree because there is no proviso for a resolution process. The prince is also head of state.