Going on a walk around the Old City's Walls was one of the first things we did on arrival and we were really glad we did. It was a gorgeous sunny day and the walls are simply incredible. The views both inwards to the Old City and outwards at the sea, the surroundings islands and the rest of Dubrovnik were incredible. The wall itself is amazing too.
As it was March, it was fairly quiet but there are lots of places to stop and relax if you need to. There is also a cafe (and toilets - although you need to pay) on the part of the wall closest to the sea where you can buy refreshments and a little further on, you can get to the "Hole in the Wall" which is a little bar stuck on the rocks outside of the wall, facing the sea and the beautiful island of Lokrum.
Although there were a lot of steps and it covered a good distance (we were told it was about 2,000 metres long), it is something that could be managed slowly if necessary and there were a lot of places where you could stop. A lot of the wall was on the flat, so it was fine to wear flat sandals rather than walking shoes/boots. We probably spent a few hours on the wall but that was because we stopped a lot to take photos and enjoy the views. You could do it a lot quicker than that for sure.
It would definitely be a good idea to walk the City Wall as one of the first things you do, that way you get a greater sense of where things are in the Old City. Although the entrance fee was 90k, rather than the 70k we had expected, it was something we're really glad we did as it truly is an amazing wall with wonderful Forts (Bokar, St John's Fortress and then the Minceta Tower) and beautiful views. Awe-inspiring really.
An added bonus is that the entrance fee/ticket also gives you access to Fort Lovrijenac (St Lawrence Fortress) - which you can visit on the same day as the City Walls or the following day. For us this was the most spectacular of the Forts and well worth a visit. Structurally, it is an amazing building, and though not connected to the City Walls, forms part of the city's defences. This three-storey building is fun to explore and also offers majestic views - particularly of the walled Old City. To get to it, take the alley behind the Restaurant Nautika near to Pile Gate (from in front of this restaurant you can see the Fort to the right and Fort Bokar and the City Walls to the left). This will lead you to the small harbour situated below Fort Lovrijenac and if you follow this round, it'll take you to the steps leading up to it.
Time-wise, if you want to relax and take your time (maybe stop for refreshments), as well as visit Fort Lovrijenac, you could easily spend over 3 hours doing this. Of course, you could zip round quicker but to honest, it was a wonderful way to spend a sunny day. Unfortunately, due to the number of steps, it could be incredibly tricky to do if you have problems walking.Taking a bottle of water and nibbles is definitely a good idea, whether you stop for refreshments or not.
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