SIENA, ITALY - APRIL 05:  A general view from the passageway under the roof  seen during the press preview of "La Porta del Cielo" at Duomo on April 5, 2013 in Siena, Italy. The newly launched "Door to Heaven" from April 6th will allow visitors to enjoy a spectacular new view of the Duomo and the city of Siena.  (Photo by Marco Secchi/Getty Images)