Cienfuegos known as La Perla del Sur. It is known for its colonial era buildings. In the central square, called Parque José Martí, the Tomás Terry theater has gold leaf mosaics and ceiling frescoes. The Provincial Museum explores the colonial history of the city. The Arc de Triomphe commemorates Cuban independence. Ferries cross the bay to Jagua Castle, an 18th-century fortress. To the south of the city, on the Caribbean coast of the island, Playa Rancho Luna has beach resorts and a dolphin park. Numerous offshore dive sites include the enormous coral formation of Notre Dame.