The laces to access the Carlsbad caves in New Mexico. - Susan Montoya Bryan / AP / SIPA

Like Professor Otto Lidenbrock invented by Jules Verne, in New Mexico, you can make a Voyage to the center of the Earth  by traversing the caves of Carlsbad. To access them, two options: a 230-meter descent in laces or a lift…. In the Big Room, America's largest underground room in XXL dimensions - 78 meters high and 1.2 km long - we could welcome the Washington Capitol. This Unesco World Heritage site in 1995 was not excavated by rainwater runoff from the surface but by underground sulfuric acid baths. And the visit does not end until nightfall with the exit of thousands of bats from the caves to go hunting.

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