Fodor's Expert Review The Big Room

With a floor space equal to about 14 football fields, this subterranean focal point of Carlsbad Cavern clues visitors in to just how large the cavern really is. The White House could fit in one corner of the Big Room, and wouldn't come close to grazing the 230-foot ceiling. Entrance can be accessed by elevator or through the Natural Entrance and a 1.25-mile descending trail. Either way, at 750 feet below the surface you will connect with the self-guided 1.25-mile Big Room loop, a relatively level (it has some steps), paved pathway through the almost hallucinatory wonders of various formations and decorations. You also get a layman's lesson on how the cavern was carved. This self-guided tour costs $12; kids under 15 are admitted for free but must be accompanied by an adult. Reservations are not necessary. An audio guide is available from the visitor center bookstore for $5. Even in summer, long pants and long-sleeved shirts are advised for cave temperatures in the mid-50s.