Top attractions on the Santo Domingo tour: 1) 3 Eyes National Park is a park with four underground lagoons located within the city, each lagoon having its own name and significance. 2) The Faro a Colón lighthouse, a memorial to Christopher Columbus. 3) El Malecón, a 14-kilometer (8.7-mile) waterfront promenade along the coast, featuring pedestrian paths and more. 4) The Colonial Zone is the historic heart of the city, where many of the most important landmarks are located, such as the Primatial Cathedral of the Americas, Calle de las Damas, Ozama Fortress, the Museum of the Royal Houses, the Pantheon of the Nation, and much more.