Top attractions on the Santo Domingo tour. 1) Los Tres Ojos National Park is a park with four underground lagoons within the city, and each lagoon has its own name and meaning. 2) The lighthouse monument in honour of Christopher Columbus. 3) The Malecón, a 14 km promenade along the coast, with pedestrian paths and more. 4) The Colonial Zone is the historic heart of the city, where you'll find many important landmarks such as the Cathedral of America, Calle de las Damas, the Ozama Fortress, the Museum of Royal Houses, the Pantheon of the Fatherland, and much more.