Make sure they have people in them that you are traveling with. If you are traveling alone take videos of yourself with the cool stuff in the background. It will make them much more interesting when you view them later. It's also a "see, I was there and I didn't just steal this off the internet."
The same is true for pictures. A cool building is a cool building, but you can find building pictures on the internet. Having your friend of family member or yourself standing in front of the building is a different story.