If I was picking a name for this museum, I wouldn't use the word "naval." Istanbul Maritime History Museum would be a better fit. Or better yet: Royal Water Taxi Museum. But what impressive water taxis they are!
Hagia Sophia is old. Very old. The building that currently stands on the first of Istanbul's famous seven hills dates back almost 1,500 years and has had a remarkable and colorful history. It's also a beautiful place to visit.