Here are a couple of shots inside the Cathedral of Barcelona. I took these on our first trip when we stayed right across the street. I walked over first thing in the morning, which was apparently a good idea because soon thereafter the crowds began grow. This cathedral is the centerpiece of the city's gothic section and is a huge attraction.
These were shot handheld because I didn't bring a tripod. Actually, I didn't think it would be allowed so I didn't even try. But as I recall, someone else did have one. Nevertheless, I shot these with the help of stabilization on the Sony sensor and the images came out fine. I have two very expensive tripods, but I'm finding I use them less and less these days due to the advancements in the digital sensors.
After looking around I went back to the hotel for breakfast. Then returned about an hour or so later. By that time the crowds were enormous. I was glad to have made the early visit and take these pictures. And maybe if I ever do that again I'll bring a tri-pod, or maybe not.