Prince of Persia. Prince of Persia has a new game coming out. New movie, too. It's set in Persia, Persia has sand. All of which explains this giant Prince of Persia sand castle!
It's been built in London, and while it's a shameless marketing ploy engineered in order to gain column space on video game websites, I have a soft spot for sand castles. Which is how we find ourselves in this predicament.
Any sandophiles in the house, it took 16 tons of sand to make, and over 1000 litres of water to get it sticky enough they could have it look nothing like the Prince.