Carlsbad Caverns

🔊/ˌkɑːlzbæd ˈkævənz/
🔊/ˌkɑːrlzbæd ˈkævərnz/
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  1. a series of beautiful underground caves in the US state of New Mexico. They were discovered in 1901 and are more than 40 miles/64 kilometres long. The Carlsbad Caverns National Park was made a World Heritage Site in 1995.