The Marble Caves (Cuevas de Mármol) are natural rock formations located in Chilean Patagonia near the Chile-Argentina border. These caves are renowned for their breathtaking beauty, having been shaped over a period of 6,000 years by the gentle erosion of the lake waters against the marble rocks. Accessible by boat, the caves can be reached from Puerto Rio Tranquilo, which is close to the Carretera Austral. Music: 'Adrift Among Infinite Stars' by Scott Buckley - released under CC-BY 4.0, www.scottbuckley.com.au