The Cave of Melody is the beautiful geometric columns that make up the walls were formed by lava, and the echoes of the waves create an eerie melody when they bounce off the arched roof. The cave has a large arched entrance and is filled by the sea. Several local companies include a pass by the cave in sightseeing cruises from April to September. However, it is also possible to land elsewhere on the island and walk to the cave overland, where a row of fractured columns forms a walkway just above high-water level permitting exploration on foot. From the inside, the entrance seems to frame the island of Iona across the water.