The Holy Father invites you to take a virtual tour instead:

Dear friends, we invite you to take a virtual tour of the Archbasilica of Saint John Lateran, Cathedral of the Diocese of Rome and official seat of the Bishop of Rome, Pope Francis.  Thanks to the collaboration with Villanova University, Pennsylvania, it was possible to realize this tour and allow people from all over the world to visit all areas of the Basilica and admire the smallest details, without actually travelling to Rome.