A delightfully-accessible 13th-century fortress that now lies in ruins above Bosanska Krupa, this should be your first stop when in town. There isn’t a huge amount to see within the ruins (they are ruins, after all), but that intangible sense of history that only decrepitude can create is most certainly here. The views are stunning too, extending over both side of the city with the rivers playing a starring role. The fortress was originally in Croatian hands, although it eventually fell to the Ottomans in the 16th century, at which point the town began to grow. The Ottomans were sure to keep this spot well-stocked, as it was an important stronghold for their ambitions to spread west, although it never really worked out for them in that respect. This is history, intangible history, with added beauty.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.