The hook
A deep, twisting bay that looks like a fjord but is really a drowned river canyon, walled in by grey mountains, with a medieval Venetian town at the far end under a fortress wall that climbs the cliff.
01Why it's worth it
The Bay of Kotor cuts far inland between steep karst mountains, and though people call it Europe's southernmost fjord it is actually a submerged river canyon, which is why it feels so enclosed and dramatic. Around its shores sit old maritime towns from the long Venetian centuries, chief among them Kotor, a tight walled old town of churches and squares at the head of the bay. Above it, a set of fortifications zigzags up the mountainside; the sweaty climb to the San Giovanni fortress rewards you with the whole bay laid out below. The catch is cruise ships: on a heavy docking day the small old town is overwhelmed. The bay is big enough, though, that a drive around its edge, past the little island churches off Perast, quickly finds calm.
02How to experience it
Climb the town walls to the fortress early before the heat and the cruise crowds, and drive or boat around the bay to Perast and its two islet churches. Stay overnight so you get Kotor's lanes after the ships leave.
From the locals
Travellers keep discovering it almost by accident and then insisting others do too: one backpacker called Kotor and Montenegro "absolutely beautiful… a gem few outside the region seem to be very aware of," and another described scrapping a whole itinerary to detour here after "a boat full of Aussies insist it's a must see." The word-of-mouth pull is the tell.