The Fortress can be visited
Kyrenia Castle

East of the old city harbor of Kyrenia, Kyrenia Fortress stands, a historical structure on the north coast of Cyprus. Its history dates back to the 7th century.
History+
The origins of Kyrenia Fortress lie in the 7th century, when the first fortifications were built. In the 10th century, these were expanded by the Byzantines. Another phase of expansion occurred in the 16th century under Venetian rule, particularly in the context of conflicts with the Ottomans. Later, the fortress served as a prison for the Turks before being transformed into a tourist attraction.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Kyrenia_Castle2.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 35.3413, 33.3222