"Why did you build the castle so near the airport?"
Cross-cultural explanation:
Windsor Castle (where the Queen lives - you don't think she actually
lives in Buckingham Palace do you?) has been continuously occupied for over 900 years.
It is also on the flight path from Heathrow (built 1946)
The apocryphal story has the American tourist asking the guide "why did you build the castle so close to the airport?"