Perched atop an extinct volcano, the fortress-like Ypsilou Monastery offers some of the most breathtaking views on the island, stretching all the way to the sea. It's a wonderfully peaceful spot; after you navigate the winding road up, you can explore the historic main church and a small museum filled with precious artifacts and ancient books. The serene courtyard is the perfect place to soak in the tranquility before you head back down.