Maiden's Tower near the entrance to the Bosphorus, Istanbul, Turkey photographed in June 2010.
...not an arrow's flight from [the] quay stands the "Maiden's Tower," a small and picturesque castle, built upon so diminutive a rock that its foundations cover the whole surface, and give to the edifice the appearance of floating upon the waves.
Julia Pardoe, Beauties of the Bosphorus (1838)
Maiden's Tower during Pardoe's time. It looks like the tower has since been rebuilt and it now looks quite different than it did in the early 19th century.