As a tax haven, the Gibraltar is an ideal place for art dealers and collectors to store and sell their precious collections of cars, paintings, antiques, clothes… The tunnels inside the rock, hewn out during Gibraltar's long history as a fortress, are converted to the biggest art storage site in the world. The tunnels are a climate controlled, high security zone, deploying state of the art technologies to protect the contents. On just one day of the year the tunnels are opened for public view. People flock from all over the world to glimpse of the treasures.