Opened in 1711, the Carignano theater never ceases to surprise and delight its fans. In 2000, for example, renovation works uncovered in its subterranean floors such curiosities as a beer brewery built on King Charles Albert's orders as a private locale in which to entertain his personal guests between play acts, and even part of Roman-age wall. The most fascinating discovery, however, was that of a tunnel connecting the theater to the nearby Egyptian Museum: a proper secret passage, of still-mysterious purpose.