Eminönü is the best place to know about the Byzantium Empire as ancient Byzantium was built on the areas roughly covered by Eminonu. With low population, it is one of the main tourist attractions of Istanbul. It is still a bustling city with the busiest ferry crossings for the Bosphorus and the Marmara Sea. During the day you will welcomed by many merchants, hordes of shoppers and tourists. The night in the same place is quite the contrast as it with graced with peace and quiet, a little too quiet perhaps.