Le Morne Brabant, Mauritius

A freestanding basaltic mountain hulking over a bright blue-green Indian Ocean lagoon certainly makes spectacular scenery. When viewed from above, the surrounding sand and silt form an optical illusion that appears to be a massive underwater waterfall at this mythic place. Thanks to its isolation and near-inaccessibility, Le Morne sheltered people who escaped enslavement during the 18th and early 19th centuries.