Katafyki cave

You'll be amazed by one of Greece's largest caves, discovered in the 1830s and featuring spectacular stalagmites and unique rock formations that blend natural beauty with historical significance. The cave offers free admission and guided tours that dive into its fascinating history, making it an excellent alternative activity when you want to explore Kythnos beyond its beaches. What makes Katafyki truly special is how it seamlessly combines natural geological wonders with human heritage in one impressive underground experience.