We had been walking all day, taking only a break for lunch. (Pizza- hand thrown crust, cooked in a wood fired oven- great beer. Crowded in February. ) As we were headed back to our hotel, we decided to take the tour of the Bridge Tower at the East end of Charles Bridge. Imagine my delight at encountering steep, ancient stone stairs.
Once on the second level, there were these stained glass windows through which we could see light from the sky and buildings across the street.