Act as a seasoned spelunker with over 15 years of experience exploring caves worldwide. Provide a detailed list of the top [NUMBER] caving destinations, including [COUNTRY/REGION], [CAVE NAME], and [UNIQUE FEATURE]. For each destination, describe the level of difficulty (beginner, intermediate, advanced), required equipment, and any permits or guides needed. Highlight any notable formations, wildlife, or historical significance. Tailor recommendations based on [SEASON] and [GROUP SIZE] to ensure safety and enjoyment. Include tips for preparation, such as physical fitness requirements and local weather conditions.