For nearly 200 years it never stopped burning. The Izalco was in continuous eruption from 1770 to 1966, and its glow served as a beacon for ships in the Pacific: that's why they called it "The Lighthouse of the Pacific." Today it rests, its near-perfect black cone cut against the sky — one of the country's most iconic landscapes. Climbing its slope of loose lava is hard, but the silhouette is worth every slip.