Brazil's Caverna Janelão comes from a fantasy tale, featuring red mushroom-shaped geological formations. Through its vast 328-foot entrance, the tranquil Peruaçu River flows, and natural skylights illuminate it.
The majority of glacier caves are temporary. Rushing, melting water carves out space in the glacier during warm months, and the cave solidifies during cold months. It may not occur in the same area every year.
The limestone Majlis Al-Jinn cave, formed 50 million years ago, may be the world's second biggest chamber, hidden beneath a rocky plateau in the eastern Al Hajar Mountains.
Bioluminescent glow worms, gnat larvae, illuminate Waitomo Caves' ceilings like millions of blue twinkle lights on New Zealand's North Island.
Sunlight from above the karst window illuminates Melissani Cave's two rooms' turquoise lake. This mysterious place is mythical.
The Jurassic Cave of Three Bridges, also known as the Baatara Gorge Waterfall, has three massive limestone bridges. The structure looks like a mossy, karstic coliseum that dwarfs visitors.
UNESCO World Heritage Site of Phong Nha-Kẻ Bàng National Park in central Vietnam rewards trekkers with the stunning Hang En Cave after an hours-long hike over mountains, valleys, and streams.
Wind Cave National Park has almost 150 miles of cave passages with boxwork, one of the world's rarest and most intriguing geological structures, beneath the buffalo and prairie.