Shandra is the golden city the ancient Shandians used to inhabit.
Golden Bell: The golden bell of Shandra is the symbol of their civilization and was used in religious ceremonies. However, once Montblanc Norland left, they have since rang the bell every day so that he would be able to find his way back, until the island was launched into the sky. On the bell's base is the Poneglyph of Shandra, along with a note from Gold Roger