Koror is the gateway to the stunning Rock Islands, a UNESCO World Heritage Site that features over 400 limestone islets, coral reefs, and marine lakes. One of the most famous attractions is Jellyfish Lake, where you can swim with millions of harmless jellyfish that have evolved without stingers. Koror is also the largest and most developed city in Palau, offering a variety of shops, restaurants, and accommodation options. You can learn about the rich history and culture of Palau, which dates back to ancient times and has been influenced by various colonial powers, at the Belau National Museum and the Etpison Museum.