Rumelihisarı or Boğazkesen Castle is a medieval fortress located in Istanbul on a series of hills on the European banks of the Bosphorus. The fortress also lends its name to the immediate neighborhood around it in the city’s Sarıyer district.  And in 1923, someone wrote a long message, with address (we think), in a most florid handwriting — but the card was not postally used.  Grade: 4