The City of Kotor was founded during Roman Times. After the Downfall of the Roman Empire the Region became part of the Byzantine Empire.
From the 12th century onwards, the region was mainly part of different serbian states, but was also part of Ragusa, Venice, Bosnia, Bulgaria, Hungary, Austria or Italy at some times. And the Ottoman Empire was always next door for centuries.
The very impressive city defences are there for good reasons.
The cache will be a quick find in the lively city center.