Zakynthos Island's Navagio Beach is only accessible by boat, hidden inside towering limestone cliffs that make you feel like you've sailed straight into a movie set. The rusted wreck of the MV Panagiotis, a smuggler's ship that ran aground in 1980, sits dramatically on the brilliant white sand like a permanent prop. The water here is so blindingly turquoise it almost looks fake on camera — but trust us, it's devastatingly real.