Los Tres Ojos, Santo Domingo

Declared a tourist attraction in 1970, the floors of these caves are filled with beautiful circular lakes fed by the Brujuelas, a subterranean river. The sulfurous waters of the first lake, discovered in 1916, are only 20 feet deep. The second, named La Nevera or "refrigerator" in English, drops to 15 degrees centigrade. The Women's Lake, the third and smallest, is warm and shallow. A fourth lake, measuring 300 meters deep, is named Los Saramagullones after a species of ducks that inhabits it.