At 955m above sea level, Buffavento castle stands the highest of the three crusader castles in Cyprus. It probably originated as a Byzantine watch tower to guard against Arab raiders in the 10th century. The castle was extended during the Lusignan rule (1192–1489). The Lusignan kings used the castle mainly as a political prison. In particular, Peter I when reluctantly warned by his friend John Visconti of the queen's infidelity, repaid the favour by imprisoning and torturing him at Kyrenia, and later locking Visconti up at Buffavento to starve to death. By the 16th century, the castle was dismantled by the Venetians in an attempt to protect themselves, as their focus moved to the strongholds along the coast at Kyrenia and Famagusta.
From the seaward side, the castle is almost invisible, and the best long distance view is from the Nicosia side, where you can clearly see the remains of the castle bulging out from the top of the mountain. On the top level there are remains of a few buildings and a ruined chapel. However, the climb is worth it for the views alone, taking in Kyrenia, Famagusta, Nicosia and, on a good day, the Troodos Mountains.
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.