The city walls are what you'll see most probably as the first thing in Dubrovnik. They circle the whole of the Old Town, making the city appear like what it was - a great citadel. The walls are immense - reaching 25 meters of height, that's boosted in some places by the fact they stand on rocky cliffs. A walk along these walls is a must-see if you're in Dubrovnik.
The entrance is located next to the Pile Gate, just make sure your camera's prepared and you have something to drink and a hat (the Dalmatian sun can take a heavy toll on you if you're not prepared - there's very little shade on the walls). There's also some stair climbing along the way, so children might better wait down below.
The walk will take you all around the city - from the towers in the north giving you a view of the Lovrjenac citadel on the hill on the other side of the bay (looking even more impregnable than the city itself) - to the sight of the Adriatic - and the nearby island. You can even get a glimpse of a beach of some sort -to me it was perhaps the most odd and dangerous place to sunbathe (take a look at the picture to see what I mean), let alone swim - and yet there were quite a few people that seemed to enjoy it.
But the most prominent thing you'll notice will be a sea... inside the walls. A sea of red roofs, that is - that's what makes this such a great sight. You'll look down at the church spires, gardens - yes, there are gardens inside the walls as well.
And you will look down at the narrow, crowded streets as well , as you'll catch a glimpse of everyday living in Dubrovnik through an occasional open window - dishes cooking, old people resting on the balconies. That's what - in addition to all the breathtaking views - makes the walk unique.