Prepare to be amazed as you descend into the belly of the earth at the Grotte di Castellana, a spectacular underground world right here in Puglia. You'll wander through a series of breathtaking caverns, each filled with incredible stalactites and stalagmites that have been forming for millions of years. The full tour is well worth it, leading you to the dazzling White Cave, a chamber so pure it feels otherworldly. The paths are well-maintained, but wear some comfortable shoes for the walk; it's an easy and accessible adventure for most.