[{"n": "La Portada", "u": "/e/caves-and-karst-formations/la-portada/", "s": "Natural arch and protected monument on Chile's coast."}, {"n": "La Verna Cave", "u": "/e/caves-and-karst-formations/la-verna-cave/", "s": "Explore the world's largest show cave chamber, where a river cascades into a vast cathedral of limestone."}, {"n": "Lechuguilla Cave", "u": "/e/caves-and-karst-formations/lechuguilla-cave/", "s": "A solutional cave formed by sulfuric acid dissolution."}, {"n": "Ledenika", "u": "/e/caves-and-karst-formations/ledenika/", "s": "A Bulgarian cave known for icicles and karst formations."}, {"n": "Leviathan Cave", "u": "/e/caves-and-karst-formations/leviathan-cave/", "s": "Longest and deepest lava tube in Africa."}, {"n": "Lion Rock", "u": "/e/caves-and-karst-formations/lion-rock/", "s": "Lion Rock is a rock formation in New Zealand, listed among the country's notable rock formations based on aest"}, {"n": "Lurgrotte", "u": "/e/caves-and-karst-formations/lurgrotte/", "s": "Largest cave in the Eastern Alps of Styria, Austria."}, {"n": "Neptune's Grotto", "u": "/e/caves-and-karst-formations/neptune-s-grotto/", "s": "Stalactite cave discovered by fishermen in 18th-century Sardinia."}, {"n": "Optymistychna Cave", "u": "/e/caves-and-karst-formations/optymistychna-cave/", "s": "Longest cave in Europe and longest gypsum cave in the world."}, {"n": "Pamukkale", "u": "/e/caves-and-karst-formations/pamukkale/", "s": "A natural site with white travertine terraces and ancient ruins."}, {"n": "Postojna Cave", "u": "/e/caves-and-karst-formations/postojna-cave/", "s": "Second-longest cave system in Slovenia, major tourist attraction."}, {"n": "Carlsbad Caverns National Park", "u": "/e/caves-and-karst-formations/carlsbad-caverns-national-park/", "s": "A national park featuring a vast, accessible limestone cave system."}, {"n": "El Torcal de Antequera", "u": "/e/caves-and-karst-formations/el-torcal-de-antequera/", "s": "A Jurassic limestone karst landscape in southern Spain."}, {"n": "Mammoth Cave National Park", "u": "/e/caves-and-karst-formations/mammoth-cave-national-park/", "s": "Protects the world's longest known cave system in Kentucky."}, {"n": "Phong Nha–Kẻ Bàng National Park", "u": "/e/caves-and-karst-formations/phong-nha-k-b-ng-national-park/", "s": "UNESCO site protecting the world's largest cave and ancient karst."}, {"n": "Pobiti Kamani", "u": "/e/caves-and-karst-formations/pobiti-kamani/", "s": "Tubular concretions formed around ancient methane plumes in Bulgaria."}, {"n": "Puerto Princesa Subterranean River National Park", "u": "/e/caves-and-karst-formations/puerto-princesa-subterranean-river-national-park/", "s": "A protected area with a major underground river and cave system."}, {"n": "Wind Cave National Park", "u": "/e/caves-and-karst-formations/wind-cave-national-park/", "s": "The world's first cave national park, home to 95% of the planet's boxwork formations."}]