• Bandelier National MonumentOnce inhabited by the ancient Puebloans, today a land of enigmatic ruins and superb canyon scenery.
  • Organ Pipe Cactus National MonumentIn a remote and wild area in Southern Arizona, you can visit the largest concentration of organ pipe cactus.
  • Pinnacles National MonumentOffering rugged hiking trails, it protects a wilderness area containing the remains of half of a long-extinct volcano.
  • Chiricahua National MonumentAn enormous collection of weirdly-shaped rock pinnacles, remnants of a huge volcanic eruption about 25 million years ago, cover the higher regions of the park.
  • El Malpais National MonumentMeaning "bad land" in Spanish, the landscape here is formed mainly by lava flow.
  • Devils Tower National MonumentThe tower is actually the core of an ancient volcano, rising over 500 feet into the air, with an aspect of columns given by hardened cooled magma.
  • Lava Beds National MonumentThe park displays the hardened results of over thirty separate lava flows exposed at Lava Beds.
  • Top 10 Most Amazing CavesCaves are true underground museums. Primitive men used them as shelters, today we visit them, we study them, trying to learn more about these extremely (...)
  • Crystal Ice CaveThis ice cave in California has some interesting and strange ice formations.
  • Mammoth Cave National ParkIt preserves the world's longest known cave system, with over 360 miles of caves.
  • Cheddar CavesA group of two caves, home to the oldest complete skeleton in Britain.
  • Carlsbad Caverns National ParkMore than 100 caves, 250 million years old.
  • Reed Flute CaveThis tourist attraction in China is over 180 million years old.
  • Luray CavernsA magic world is revealed when visiting the largest caves in Eastern America.
  • Fantasy CaveFantasy Cave is definitely one of Bermuda's secret treasures and a 'must see' attraction.
  • Grotte de DargilanOne of the largest natural caves in France, discovered in 1880.
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