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Some of the best things on Kefalonia aren’t on the coast at all. They’re underground. Melissani and Drogarati sit just a few minutes apart near Sami, and together they make for one of the best half-days on the island.

Melissani Cave

Melissani is a sinkhole lake, formed thousands of years ago when the limestone roof over an underground cavern collapsed. That collapse is exactly what makes the place special today: it opened a hole straight to the sky, and sunlight now pours down onto a lake of turquoise water sitting inside the cave.

The lake itself is connected to the sea through a natural underground tunnel. Seawater actually enters the island near Argostoli, travels underground for about two weeks, and resurfaces here, mixing with fresh water along the way. It’s part of what makes the water so clear.

You visit by small boat, rowed by a local guide who takes you through the sunlit chamber and into a second, darker section further back in the cave. It only takes about 15 to 20 minutes, but it’s the kind of 15 minutes you don’t forget.

Practical info: the site opens at 10am and closes at 4pm, and entry is 10 euros. Keep in mind the last boat departs 30 minutes before closing, so don’t leave it too late. If you want to skip the tour bus crowds entirely, show up no later than 9:30am. It makes a real difference.

Drogarati Cave

A short drive away is Drogarati, a completely different kind of cave experience. Where Melissani is open to the sky, Drogarati is deep and enclosed, a proper cavern you walk down into rather than float through.

Its main hall is famous for its acoustics, so much so that it’s hosted concerts over the years. Walking through the stalactite formations after Melissani’s open-air lake is a nice contrast for the same afternoon.

Entry is 6 euros. If you still have your Melissani ticket on you, hang onto it: it gets you 2 euros off at Drogarati.

One thing to know if you’re chasing content for the gram: photos are welcome at Melissani, but forbidden inside Drogarati. Plan your shots accordingly.

Melissani Cave

Address: Karavomilos, near Sami, Kefalonia

Vibe: Otherworldly and serene, turquoise water lit from above, best experienced early before the crowds

Website: N/A

Drogarati Cave

Address: Near Sami, Kefalonia (on the road toward Haliotata)

Vibe: Deep, cool, and cavernous, with striking rock formations and a hall famous for its acoustics. No photography allowed inside.

Website: N/A