Edinburgh Castle is one of the city's many natural architectural sweet spots and is the centrepiece of the whole capital.
With Princes Street providing the perfect viewing spot for the castle, commuters walk or travel past it every single day, many without even looking up at the huge dormant volcano that the castle sits upon.
It could have looked incredibly different, however. That's if the mid-19th century plans as a tribute to Prince Albert, had gone ahead, culminating in a huge 160ft tower erected at the site of the castle.
