Did you know that St. Paul's Cathedral is the only cathedral to have been designed, built, and completed by a single architect? 🧑‍🎨 Step inside the fascinating Cathedral and be marvelled by its three​ domes, and over six million pieces of mosaic!✨ Climb up to the Golden Gallery at top of the dome, to enjoy a spectacular and unique panoramic view over London!😍 #LetsDoLondon #VisitLondon | Visit London