Greece is as breathtaking underground as it is above the surface. According to the Hellenic Speleological Society, over 8,500 caves are scattered across the country, but only a select few are open to visitors. Many caves have served as sacred places of worship for thousands of years, while others provided refuge for villagers hiding from enemies through the centuries. In ancient times, some caves were even inhabited, and important archaeological discoveries have emerged from their depths. These natural hollows were shaped over millennia by earthquakes and water erosion acting on the rocks. Each cave in Greece has its own unique story—each more fascinating than the last. Filled with charm and mystery, these caves invite exploration. To help you plan your next adventure, we have gathered a list of Greece’s best caves. In this guide, you’ll discover the most beautiful caves on land and at sea, recognized worldwide for their geological significance and rich history.