Poás Volcano National Park
Though nearly 2,743 meters (9,000 feet) in height, Poás Volcano is not Costa Rica's tallest active volcano (that distinction goes to Irazú), but it has plenty of superlatives to fascinate visitors, including two crater lakes near its summit. One of them, Laguna Caliente, is considered one of the world's most acidic lakes. Its turquoise beauty is misleading—since the water is entirely inhospitable to aquatic life—but it makes for lovely photos.
By Julie Schwietert Collazo, AFAR Local Expert