Versailles 3D is an application that allows visitors of Versailles immerse themselves in history through their mobile phones and tablets.

The principle is simple: having his phone at the heart of the Royal Court, at the foot of the Chapel or on the terrace gardens, visitor can see the palace at the time of his choice. His phone becomes a real window into the past by superimposing the palace today and the palace of Louis XIV.

http://en.chateauversailles.fr