Curaçao's fortunes have long been tied to the Schottegat, the remarkable natural harbor around which Willemstad was built. It's the largest harbor in the Caribbean and, behind Rotterdam, the second-largest in the Kingdom of the Netherlands. And it's allowed the island to become a great center of trade. Since 1915, the Schottegat has been home to Curaçao's Isla Oil Refinery. We took the ferry tour of the harbor offered by the Maritime Museum.