The Marabar Caves are a group of limestone caves located near the town of Bihar in India. They are famous for their unique geological formations and are believed to date back to the 1st century BCE. The caves are known for their echoing sound, which has intrigued visitors and inspired literary works, including E.M. Forster's novel "A Passage to India."
These caves are part of the Ajanta and Ellora Caves complex, which is recognized as a UNESCO World Heritage Site. The Marabar Caves consist of around 30 caves, with the most notable being the Lomas Rishi Cave, which features intricate carvings and ancient inscriptions.