(Encyclopedia) Carlsbad Caverns National Park, 46,766 acres (18,940 hectares), SE N.Mex., in the Guadalupe Mts.; designated a national park in 1930. These connecting limestone caves, with remarkable? (Encyclopedia) Carlsbad krlzb?d. 1 City (1990 pop. 63,126), San Diego co., S Calif., on the Pacific coast; settled in the 1880s, inc. 1952. Carlsbad is a booming San Diego suburb; its population? (Encyclopedia) cave, a cavity in the earth's surface usually large enough for a person to enter. Caves may be formed by the chemical and mechanical action of a stream upon soluble or soft rock,? (Encyclopedia) New Mexico, state in the SW United States. At its northwestern corner are the so-called Four Corners, where Colorado, New Mexico, Arizona, and Utah meet at right angles; New Mexico is? The United Nations Educational, Scientific, and Cultural Organization (UNESCO) has identified 878 World Heritage sites that it considers of ?outstanding universal value.? In the United States? How to find adventure and excitement on holiday by Elizabeth Olson Related Links America's Best Beaches World's Most Visited Tourist Attractions?