We tried to go to St. Paul's earlier in the week but due to an overnight storm knocked out many of the overground train lines so they didn't have enough people to open the cyrpt or the dome. We opted to come back later in the week so we could get the full experience! The outside is just beautiful but capturing it was difficult since you couldn't get far enough way for it to fit in the picture.
You can tell these pictures were taking on two different days because the sky is completely different colors in the sets.
The pictures do not do the size of this dome justice. It was enormous and visible from most anywhere in London.
You were not allowed to take pictures of the inside so I stole a few from online just because it is unusual and incredibly ornate.
Interior pictures from here, here, here and here.