These are some pictures from the inside of St. Vitus:
I learned through my impressive eavesdropping skills that the stained glass above is the history of Christianity in the Czech lands. The two figures at the top in the center are Saints Cyril and Methodius. They are the Greek brothers who originally brought Christianity to the area. Below them and pictured in the close up below are a young Saint Wenceslas and his grandmother Ludmilla. I stopped eavesdropping after these figures were pointed out, so I have no idea who the rest of the people are.